personally, i use ad-aware, ewido anti-spyware, and mcafee anti-virus. mcafee is a $90 virus protection program that i got for free because i use comcast. i started using mcafee because norton anti-virus 2006 would not work on my computer. ad-aware is free. you can download a free 30 day trial of ewido and then maybe consider buying it. if you are using comcast then you are in luck.