I agree with t, goto www.grisoft.com, housecall online scan and download cwshredder this as well. I also use Spybot search and destroy and C Cleaner both available from www.filehippo.com. All these progs are free and have kept my PC's running as fast as ever and infection free. C Cleaner also sorts out your registry, and gets rid of old stuff that is no longer used by your PC. It also offers to back up your registry before changes are made so you can re-instate it easily. Basically, it's idiot proof.. My kinda software!
Nige, March 2008