Will it let you restart at all? If so, download
Spybot Search and Destroy at
http://www.Safer-networking.org/
and Malware at
http://www.malwarebytes.org/
these will remove the virus and they are free. When I ran them on my pc after contracting a virus it said I had 411 infected files! They fixed them all.
If it won't let you start up at all, you'll have to take it in to a computer guru and get it fixed or replace it. It'll cost about the same thing either way.
I'm sorry :-(