I accidentally deleted a registry when trying to delete a virus setting. Now my Wifi isn't working. I have a PCI card. It looks like my ip configuration isn't saving properly....gotta feeling I did something really bad.

do you happen to know what registry key you deleted? Do you get any error messages
Read this link
http://support.microsoft.com/default...9&Product=winx

I know the horse is already running past the open barn door, so I probobly don't need to tell you this, but ALWAYS backup the registry before you make any changes

Also, I don't know if this works, but try system restore, however, system restore can also restore old viruses. Then, another thing you can try is to restart your computer, and as it starts to reboot, hit the F8 key repeatedly, until you get the the advanced optons menu
here's link for the choices and what they do
http://support.microsoft.com/default...2&Product=winx

try 'Last known good configuration
Also, you might want to try your Installation cd to do a repair.

definately read this..
http://support.microsoft.com/default...&Product=winxp