What do you do if your computer has been infected by a virus?

Linux

Install the operating system disk.It cleans the files you saved since last install but during the install prompt will ask you good questions to keep things in order.What do to you got to lose anywayYou are trying to get back the system.

Start up the system in safe mode. It worked for me!!

There are three most common solutions which i practise. First one is to install operating system on second partition (bare sistem only with antivurs), (works with XP/2000) and clean your infected partition, after cleaning your virus on infected partition you can safley remove your second system (or leave it for other time :), second one is to install Linux on other partition and clean it safely from there (similar as the first solution), and third one is to unhook your hard drive and attach it to other uninfected computer as slave drive and disinfect it from there (most common and simplest solution).

-dmc

For support within the United States and Canada, call toll-free (866) PCSAFETY (727-2338).

This is the Microsoft virus line, the call is free if you call them they will walk you though the steps for virus removal

Get a boot disk with a virus scan program on it.

If you're using XP - turn the computer on, when the Windows screen comes up, unplug the computer. plug it back in, turn it on, and theres a choice that comes up to use the last good configuration

Other OS's - I don't know