Download AVG Free.
<a href="http://free.avg.com/download?prd=afe">http://free.avg.com/download?prd=afe</a>
It'll find EVERYTHING that's invaded your computer and get rid of it.
After it's done, you can try to back up your files onto an external. After THATS done, do a system restore to factory settings.
The same sort of thing happened to me.
AlexCo
poo. :l
la-yinn
Inorite