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How can I stop usb asking to be formatted?

I'm not sure what I have done but everytime I now go to use my usb i'm told it needs formatting and I can't retrieve any of the saved files (coursework due in one weeks time AAAH!). I just keep cancelling but something tells me I've probably already wiped the files. I am a bit of a computer novice. Any advice?
Jacqui, July 2009