The best thing to do is Buy Anti Virus software. You can always Restore your Computer to a recent version if your on XP or Vista. Vista makes Restore and Recovery the easiest
Antivirus programs can be used to remove trojans from an infected computer. This can be done simply by running a scan with the program on the infected computer.
Yes. Just make sure your antivirus program is running.
The short answer is yes it probably is running a bit slower while the anti virus program is running but not as slow as a system infected with a virus. If you are worried about performance schedule the anti virus program to run at a time when the system is not in use ie. overnight and let it run.
If you are able download a free virus program and scan your computer. One of the best is malwarebytes ae many others abase,avg,panda, just to name a few. If you can't get online on the infected computer use another one to either download the programs to a disk or a jump drive.
Vipre includes a number of antivirus software products. These products could help the running of a computer by ensuring they don't get infected by viruses and other web threats.
Either download a new anti-virus program or completely reboot your computer.
AnswerAntivirus programs analyze data being sent to and from. They also monitor programs running on your computer to make sure they are not malicious. Having more than one antivirus program running is dangerous because the two antivirus programs may interfere with one another. As a result, malware may be able to infect your computer because your antivirus programs are interfering with one another. Uninstall one program before you install the other. Personally, I have had to antivirus programs installed at once but i disabled one of the programs. Keep in mind, I only did this because I thought one program was not detecting all of the malware on my computer. However, most users do not know how to completely stop a program from running without uninstalling it. Like I said before my suggestion is to avoid have more than one antivirus program installed.
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AnswerNot updating your antivirus software makes a number of threats more likely to occur suchs as being infected with malware (malicious code) or being the victime of a phishing attempt and having your identity stolen. If you often forget to update then download a antivirus program that updates automatically. For example, Avast Free Antivirus checks for an update every time the computer boots and at a set time interval while the computer is running. You can download avast at Avast's website for free. Just google it.
Your computer could be infected with something if it suddenly runs slower or begins doing strange things. You can check the Task Manager for any new processes running that you are unfamiliar with. If you believe that it is infected, download an anti-virus program and have it scanned.
Generally speaking yes, most viruses are either.exe or screensaver programmes disguised as something else or part of another programme but they generally need to be run in order to do anything. Most antivirus programmes will alert you that a program is infected with a virus and prevent you from running it.
Anti-virus software are programs that run on your computer. At any one time there are lots of programs running on your computer. The more that are running, the slower the computer can work. So when you install a new program like anti-virus software, it is an extra program to run which will make your computer slower. It is still important that you do use anti-virus software, even if it does slow down your computer.