Hi my computer had problems with error popups and trojan popups all the time so I decided to reinstall windows and everything is fine now except I keep getting a windows registry error. I've done this one other time and the Comcast guy set up everything for me and I can't find out how to finish the registration. I have windows xp. Also any advice on good anti-virus would be appreciated. Right now I see that Adware SE, Spybot, and CCleaner are good. Thanks