Virus has taken over!

I need help please! Something infected my pc, it's not allowing any operation at all. I can't turn the computer off, the screen goes into sleep mode within one second and is just black when it's on, I tried f8 but whith no screen it doesn't work. I have XP Pro, I was getting messages that windows couldn't verify my XP program, I ignored it. Also noticed that this virus was turning off my firewall. Has anyone encountered this type of problem before? Im not that savvy of a computor user, and I would hate to lose all my pictures and other files.





via Bleeping Computer Last 20 Posts http://www.bleepingcomputer.com/forums/t/512987/virus-has-taken-over/