Unmoutable drive???

[Fjalle[FIN]]

Hi, I run windows xp proffesional and it works fine for about 3 to 4 weeks, and then at the startup there will come a blue screen that says:
Windows won't go any further because it could damage your computer.
And that I have a unmoutable drive.
So what's wrong and what sould I do???

 

[Fjalle[FIN]]

I don't realy remember the error word for word but it goes something like this.
Stop 0x000000ED, 0x0000087E, 0x0000068F.......
Unmountable_Boot_Volume??
And no I haven't installed SP1, but I'll do it right away.

 

[Fjalle[FIN]]

Yeah I think so to I run the recovery process once earlier, it helpt for a while but then the error came back so I decided to re-install windows.
Thanks for helping!!!