|norton is one of the worst, but anyways, try tapping f8 on bootup and choose safe mode with networking. There you should be able to download some anti-spyware progs.|
If that doesn't work, download the progs to a thumb drive and then load them onto your problem PC.
First thing you can do is go to start/msconfig and then disable all the startup items.
You could scan with
2- Trojan Remover
3- Hitman Pro.
Those 3 should help in cleaning up your problem.
Some HELP in posting on Computing.net plus free progs and instructions Cheers