If you have had multiple virus infections and your computer is still not running properly after removing them I would reload the machine and then promptly install some firewall and antivirus software BEFORE connecting back to the internet. Just because you "remove" a virus it doesn't mean that any damage the virus did has been undone. There could still be damaged files or remnants of the malicious code on your system. A reload is the only way to be sure that you fix what the virus did.
ok so i've had a new computer for a bit and have recieved a few viruses, when i go to play games they will always freeze and not respond, Mozilla keeps shutting down or freezing, most of my programs are on the fritz, but worst of all my system restore doesn't work, i've done virus scans and what not and found all of them and deleted them but its still messing up. currently running Vista ultimate 32-bit im not sure what else you guys will need so if you guys need anymore i'll try to tell you.