Remember a virus is in computers memory. You can have the best AV software cleaning the files and at the same time a virus infecting the files. Some viruses will just turn off your antivirus software. That is why you should boot from a startup, which is free of viruses in order to clean the virus.
Viruses can spread over the LAN too. When you clean a virus from a networked computer, turn the network off and do not put it the computer to the network before you clean all the computers.
At the time of this writing I can recommend you commercial AV programs:
I can also recommend the following, as they are free for non-commercial use on your personal computer:
When cleaning a virus, it is a good practice to find some cleaner programs on the internet. Many AV companies release free utilities for cleaning particular virus. I advice you to run a couple of them despite how good is your AV program.
The term: TSR (Terminate Stay Resident) Back in DOS days you could not run a couple of programs at the same time. You had to wait for a program to terminate in order to run another one. The program made a resident part of itself, and then terminated (exited) in order to let you use DOS shell again. So, terminate was an important fact that is why the name Terminate (and) Stay Resident got long.
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