Probably your didk is failing.
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http://www.g2mil.com/Dec2003.htm
"Garth Overmyer" <(E-Mail Removed)> wrote in message news:0baf01c3b871$d4b82900$(E-Mail Removed)...
> My computer has been locking up and the screen goes black
> and says "Operating System Not Found". I restart my
> computer and it works fine, but it keeps happening. I
> think it has something to do with these automatic updates
> that Microsoft does not provide support for after
> downloading them.