They are all malware; however, none of these act without a user's knowledge by definition (though rootkits typically do attempt to hide themselves). Nonetheless, many viruses, worms, trojans, and rootkits do attempt to hide themselves from users; some of them do so quite well, and others are rather unsuccessful. Viruses which fail to run, returning error messages instead, for example, may alert users to their presence in this manner.
Basically. All malware act with malicious intent without the victim's knowledge or approval.
computer viruses, worms, Trojan horses, and rootkits
"Malware" is short for "malicious software" - computer programs designed to infiltrate and damage computers without the users consent. "Malware" is the general term covering all the different types of threats to your computer safety such as viruses, spyware, worms, trojans, rootkits and so on.
Rootkit is a type of malware that hides its presence while it's active on a computer. Rookit hides other malware too. It can be extremely difficult to remove a rootkit from a computer. However, solid antivirus software usually removes rootkits without any problems. Source: http://deletemalware.blogspot.com
Programs are installed on your computer all the time without your knowledge when you browse the Internet. Adware is the name of the programs that are installed with the purpose of collecting information about you.
d. spyware
Malware is software designed to install itself and run without your consent and without your knowledge. It usually installs when you download something and do not read all the details (malware is hidden away within this long document).
Malware, short for malicious software, is software designed to infiltrate a computer system without the owner's informed consent. Some computers are invaded with malware that causes damage to the computers. Malicous computer is a computer that has a malicious code and it is passing it to other computers.
UAC
Generally called a virus, but there are many types. The most destructive are root-kits. These will bury themselves into the programming of the Operating System and from there can affect any part of the system.
It appears that most sites have blocked project free tv because people are complaining that malware is being loaded onto their computer without their knowledge.
Of course it can. Most of the time spyware enters a computer without user's persmission and knowledge.
there is someone Spying your computer without your knowledge.