wont boot up

It was ******* fine yesterday and suddely this morning it gives me this when on the windows xp loading screen..

unmountable boot volume..

I could just format but I have rubbishrubbishrubbishrubbish loads of stuff on their which I cant really loose, is their a way to fix this..?

cheers

check all your connections in your pc

ie. check ide connections to hardrive and to the mobo etc.

or try to "repair" the windows xp installation.

P.S. sorry for the vagueness

all the connections are fine and the windows repair thing dont work