Cannot access/read a folder, asks to format

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Hi all,

Weird problem here, a folder under my C:\ drive that contains ALL my
mp3's is now suddenly inaccessible. When I
click to open it it says "C: is not formatted, do you want to format
it now?" or something like that.

Please advise. I simply cannot lose my 40GB & 5 years worth of
music!!! :(

Thanks!

.