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Computer Viruses
Computer viruses are harmful pieces of software which can reproduce themselves and automatically spread to other computers and networks. Questions about computer virus techniques and specific computer viruses belong here.
5,673 Questions
What exactly does bitdefender online scan mean?
Bitdefender Online Scanner is an antivirus software. It scans your computer for viruses, and gets rid of them after alerting you to their appearance. Be aware, that some kinds of online scanners can be viruses in themselves, and you should be careful when using such things.
Separate area of a hard disk that holds an infected file until the infection can be removed?
Well, see that it is only electronically 'separate;' it may be called the quarantine area, or the partition, or even colloquially 'the wall.'
Spooling refers to a process of transfering data by placing it in temporary working area where
another program may access it for processing at a later point in time. 'Spool ' can refer to the
action of a storage device that incorporates a physical spool or reel, such as tape drive.
For eg:- A printer can serve only one job at a time, several applications may wish to print their
output concurrently, without having their output mixed together. The operating system solves
this problem by intercepting all output to the printer. Each applications's output is Spooled
to a separate disk file. When an application finishes printing, the spooling system queues the
corresponding spool file for output to the printer. The spooling system copies the queued spool
files to the printer one at a time.
In some operating system, spooling is managed by a system daemon process. In other operating
systems, it is handled by an in-kennel thread.
In either case, the operating system provides a control interface that enables users and system
administrators to display the queue, to remove unwanted jobs before those jobs print to suspend
printing while the printer is serviced, and so on.
Some devices, such as tape drives and printers, cannot usefully multiplex the I/O requests of
multiple concurrent applications. Spooling is one way that operating systems can coordinate
concurrent output. Another way to deal with concurrent device access is to provide explicit
facilities for coordination.
Some operating systems (including VMS) provide support for exclusive device access, by
enabling a process to allocate an idle device, and to deallocate that device when it is no longer
needed. Other operating systems enforce a limit of one open file handle to such a device.
Many operating systems provide functions that enable processes to coordinate exclusive access
among themselves. For instance, Windows NT provides system calls to wait until a device
object becomes available. It also has a parameter to the open () system call that declares the
types of access to be permitted to other concurrent threads. On these systems, it is up to the
applications to avoid deadlock.
THE SPOOLING MECHANISM
The entire key to spooling is a synchronous processing, where the program is not constrained by
the speed of slow devices, particularly printers.
Printers are relatively slow peripherals. In comparison, disc devices and particularly CPU's
are orders of magnitude faster. Without spooling print data, the speed of program operation
is constrained by the slowest device, commonly printers, forcing the program to wait for the
mechanical motion of the printer, the program is known as "print bound'.
What are the good and the bad sides of hacking?
On Wikipedia, a hacker is defined as such:
"Hacker, as it relates to computers, has several common meanings. Hacker is often used by the mass media to refer to a person who engages in computer cracking and is also often by those in computing fields to refer to a person who is a computer enthusiast. At least three major hacker subcultures, characterized by their largely distinct historical development, use the term in their jargon for self-identification. They are centered around different, but partially overlapping aspects of computers and have conflicting ideas about who may legitimately be called a hacker (see hacker definition controversy). In computer security, a hacker is someone who focuses on security mechanisms. In common use, which was popularized by the mass media, that refers to someone who illegally breaks into computer and network systems. That is, the media portrays the 'hacker' as a villain. Nevertheless, parts of the subculture see their aim in correcting security problems and use the word in a positive sense. They operate under a code of the Hacker Ethic, in which it's acknowledged that breaking into other people's computers is bad, but that discovering and exploiting security mechanisms and breaking into computers is nevertheless an interesting aspect that can be done in an ethical and legal way. This use is contrasted by the different understanding of the word as a person who follows a spirit of playful cleverness and loves programming. It is found in an originally academic movement unrelated to computer security and most visibly associated with free software and open source. It also has a hacker ethic, based on the idea that writing software and sharing the result is a good idea, but only on a voluntary basis, and that information should be free, but that it's not up to the hacker to make it free by breaking into private computer systems. Academic hackers disassociate from the mass media's pejorative use of the word 'hacker' referring to computer security, and usually prefer the term 'cracker' for that meaning. In a third meaning, the term refers to computer hobbyists who push the limits of their software or hardware."
So by this definition the bad side is essentially fear mongering and a few individuals giving the whole group a bad name. According to the various legitimate definitions, there is plenty of good that can and has come from hacking. Most of the wondrous technical achievements of the past fifty years can be attributed to hackers at play, from the advent of video games with Spacewar! on the PDP-1 to the Mars rovers, and SpaceShipOne.
Every community will have its bad eggs, but if one only focuses on the few, they miss the benefit of the many.
The system tools folder is typically found?
This is highly dependent on the operating system. Further, most operating systems rarely require you to find their utilities where they are stored but you can generally just invoke them the normal way for your OS.
For Windows they are likely scattered all over C:\WINDOWS.
Linux will usually keep its system utilities in /sbin and /usr/sbin.
How do you attach a slide show with your email?
Above the place where you write the email you can see some options such as fonts,colours etc. You can see an option called 'Attach a File' click on that and attach the photo. Easy. (Note: In some of the email sites you may not be able to find the option)
How can you prevent computer viruses from attacking your computers?
To prevent computer attacks, you should have a good virus protection service. Second, you should never open emails from a person you don't know. There can be loads of viruses in there. Third, make sure nobody knows your IP address. If someone has access to your computer, that's dangerous. And finally, you should have your computer set to the mode that warns you that a website is dangerous. If the website that you're on says secure browsing/server is on, then you're good and you don't have to worry about computer attacks from there.
Difference between blue screen and green screen?
There two different colours
HA HA
No, the difference is that a green screen is more commonly heard of!
But in ICT it is the exact same
Both are differ in colors
You can get details about Green screen backdrop and Blue Screen backdrop from here http://www.photostudiosupplies.com/photography-backdrops.php
What causes my monitor to shut down for no reason even though the computer continues to run?
a few things can cause this.. you will have a outlet that you plug ur monitor that has become worn out and no longer can hold the plug in tight. or you have a bad power cable, or if ur monitor is one of the older ones that the power cable is built in then the connections inside the monitor as come loose. and if this is the case.. and if ur brave u can open the montior up and resolder the connections again.. best of luck
If your computer is infected by a Virus?
If your computer is still working and you have Anti-Virus software installed - update and run the software. If you do not have anti-virus software you should download a free antivirus program (AVG, Avast, and Avira are good choices). If your computer is compromised and you cannot download/install this software - you may need to download/install the software onto a flash drive on a different computer and then put the flash drive in your computer to scan.
If this does not fix the problem you may actually have Malware or Spyware. You will need run or install software to scan your computer - there are many free options and you should try several (Malwarebytes Aniti-malware, Spybot - Search and Destroy, and SuperAntiSpyware are good options). After installing/running these you should take care of almost anything.
If your web browser is redirecting and you cannot search for software - you may need to use another computer to find the software - or use a less common search engine to find them. There are links below as well that you can use to download them.
If after running the anti-virus and anti-malware/spyware programs your computer is still not working properly you may need to have it looked at by a professional computer repair technician.
What are the most common routes a computer system can get infected with malware?
Usually, it is software that the user installs. Sometimes they insert infected media into the computer. Or the user downloads an attachment from their email. Other times, the user might be tricked into downloading a fake plugin or codec after being told that their version is out of date.
How do you enable email attachments?
I want to attached an email I received to a new email what is this process
Can mediafire get you viruses?
Read this utopia.fans/security/is-mediafire-safe-to-use/ if you want to know more about the safety/unsafety of MediaFire. But on the whole, you have to understand that any file-sharing services are at a big risk. As all the files that are uploaded there are stored somewhere and can be hacked.
Skype does not give you viruses but before you download it make sure that you don't have any viruses already.If you do have viruses already in your computer or laptop than clear them because Skype can make the virus bigger.
Explain what a firewall is and why it is necessary?
a fire wall is a something that protects your computer from viruses and popups A mechanism that isolates a network from the rest of the Internet, permitting only specific traffic to pass in and out. firewall is a hardware or software solution to enforce security policies. In the physical security analogy,
How virus are being programmed?
They are programmed in programming languages or scripting languages like Visual basic , c , c++,java , vb script or java script.
Can a computer become infected via email?
Not normally through a simple text email. However, a virus can enter a pc through a link to an infected site or a malicious attachment. ... Yes an email can have a virus in it, but usually you have to click on a link. The basic rule is if you have been sent an email by someone you do not know, have not asked for that email then treat it with caution. Never respond to an email from someone you don't know and have a process whereby any attachment sent to you by people you know or have asked to send you something is scanned by an updated antivirus software before opening
Databases tend to get split up into a variety of diffrent catagoies based on their application and requirements. All of these diffrent catagories naturally get nifty buzz words to help classify them and make distinctions in features more apparent. The most popular buzz work (well, acronymn anyway) is OLTP or Online Transaction Proccessing. Other classifications include Descision Support Systems (DSS), Data Warehouses, Data Marts, etc.
OLTP databases, as the name implies, handle real time transactions which inherently have some special requirements. If your running a store, for instance, you need to ensure that as people order products they are properly and effiently updating the inventory tables while they are updating the purchases tables, while their updating the customer tables, so on and so forth. OLTP databases must be atomic in nature (an entire transaction either succeeds or fails, there is no middle ground), be consistant (each transaction leaves the affected data in a consistant and correct state), be isolated (no transaction affects the states of other transactions), and be durable (changes resulting from commited transactions are persistant). All of this can be a fairly tall order but is essential to running a successful OLTP database.
Because OLTP databases tend to be the real front line warriors, as far as databases go, they need to be extremely robust and scalable to meet needs as they grow. Whereas an undersized DSS database might force you to go to lunch early an undersized OLTP database will cost you customers. No body is going to order books from an online book store if the OLTP database can't update their shopping cart in less than 15 seconds.
The OLTP feature you tend to hear most often is "row level locking", in which a given record in a table can be locked from updates by any other proccess until the transaction on that record is complete. This is akin to mutex locks in POSIX threading. In fact OLTP shares a number of the same problems programmers do in concurrent programming. Just as you'll find anywhere, when you've got a bunch of diffrent persons or proccesses all grabbing for the same thing at the same time (or at least the potential for that to occur) your going to run into problems and raw performance (getting your hands in and out as quick as possible) is generally one of the solutions.
Several other factors come into place with OLTP databases, and the Oracle10g documentation library even has a whole section dedicated just to OLTP. Find more information in the Oracle10g docs:
What tool can be used to detect malicious software?
Antivirus software (I recommend avast free antivirus, it's a good one...)
Does the Ares website have viruses?
It depends on what you download
here is an answer from yahoo
If you are just trying to download songs, you shouldn't have too many problems, but If you are downloading games, movies, or other software products, try to know the correct size, and NEVER download a file that is smaller than 1 MB.
It WILL be a virus.
Also never download an exe file..only RAR files, and always scan with your virus protection
Modern technologies that help in control of diseases?
Bone Densitometry-to check the status of your bones
ElectroCardioGram-to check the beat ofthe heart
Can all computer viruses be detected?
Yes, anti-virus software automatically detect all viruses on this condition that the anti-virus software installed should be updated timely for the latest viruses. Ashish Srivastava, Rashmi khand, Lucknow
How do you get rid of E-2 error message on True Track glucometer?
Make sure you have the right test strips for your meter. The company makes several different meters with very similar names, and apparently the boxes for the strips for each one also look similar. The pharmacy accidentally gave my mom the wrong strips and she got E-8 errors every time she put a strip in
When using Windows you should create a restore point before installing new software?
Creating restore points can often be helpful before installing and removing programs in case something happens and the program fails to install correctly or is removed incorrectly.
