CPU virus question

Don't forget Windows' built in anti-virus. It works pretty good as long as you keep it updated, which is critical in Windoze anyway. After doing an update win$ will run a scan when it reboots. Things called rootkits get around this but you probably don't have one.
I have been able to get rid of most infections by running SuperAntiSpyware followed by WinDefender followed by a security update.