Fixing a virus?

about a week ago my mouse started freezing up every once in a while and so did my keyboard. by the end of the week it started getting worse, my mouse would freeze more and my keyboard would start typing random things. so i opened my antivirus and ran a full system scan. it found 3 things that were at high risk. i share my computer with my 3 roommates so i have no idea where they came from, but i got rid of them. my mouse and keyboard however are still doing it. and its a lot worse, my mouse for the most part wont work at all.. if it does it only lasts for a few minutes.

how do i fix the files that were corrupted? or could something else be wrong even?

oh gosh, please help :(

Fixing a virus?antivirus programs

You may still be infected with Spyware.

For starters, download, update and run a full scan using the following product:

http://www.superantispyware.com/

SuperAntiSpyware is exceptional and will remove the majority of difficult Trojans and Worms, not just the easy ones.

If possible it is recommended that you load the application in normal mode but run it in Safe Mode. Safe Mode can be started by continually pressing F8 during the boot sequence. If you are badly infected you might need to run SuperAntiSpyware more than once to help clean your system. If the only infections now being shown are in System Restore, once you are completely satisfied that you can boot normally, you can either delete the infected restore points manually, or temporarily turn off System Restore.