USB flash drive is unrecognizable?

I have 2GB Imation flash drive that's been fully functional for several years now. Today, when I was in the middle of working on a Word document and went to save it, suddenly I get a message that says "USB Device Not Recognized". It is unrecognized in all three of the Windows XP computers in my house, so it must be the flash drive. Could it be that it needs to be cleaned out somehow? It doesn't appear damaged in any way. I've got some really valuable information on there, so I'd like as much help as possible.