antivirus
Best Free According to PC Mag
The only free Sophos I found was for mac.. of course..
malware programs & tools
http://www.malwarebytes.org - must have and free
Combofix - one of the best malware removers ever IMO http://www.bleepingcomputer.com/download/combofix
Tdsskiller - really awesome root kit removal tool. http://www.bleepingcomputer.com/download/tdsskiller
Windows tweaks / utilities
ccleaner - http://www.ccleaner.com - a must have for any windows or mac system
Slimcleaner - one of the guys at work likes this program as well http://download.cnet.com/SlimCleaner-Fr ... ?part=dl-0
to be continued....