SOLDIERX.COM Nobody Can Stop Information Insemination

Hi, I've got a real problem with my PC. A few times recently it's switched itself off, but yesterday it totally died. I'm getting a STOP: 0x00000051 error message, can't boot in safe mode, can't use windows repair from xp disc, as these just show the blue sceen/error message . Anyone any idea? Is it possible to get into system restore somehow? I susoect it was a windows update which has knocked my machine off as it began to go wonky after that.

I managed to get most of my doc's, etc, off the HD, but would rather repair windows than reformat.

Thanks in advance, John.