blue death screen

My computer won’t boot up in any mode. It doesnt boot in safe mode or whatever mode. The message is get is"A problem has been detected and windows has been shut down to prevent damage to your computer. Technical information: 0x000000D1
I have no idead what to do. Please help

See: “If you cannot Boot the computer”
Instructions: http://forum.avast.com/index.php?topic=53253.0

I accidentally disabled the pci slot. So, now all I see is a black screen. What should I do?