blue screen-unmountable boot volume

using dell desktop 4600, xp home edition, 1 gig ram, 3.0gig pent processor, 80 gig hard drive. ati radeon x700 pro 256mb video card.

shut machine off normally last nite.
today, upon power on, receieve black screen error message screen, with options for safe mode, 3 of them, last known configuration, & start windows normally. i tried the start normally, then last known configuration, and safe mode only. each time i received a blue screen. the error message says: Unmountable_Boot_Volume.

any ideas how i even start to fix this problem?

thank you, len kiesling

.

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