I've got a big problem.

Yesterday and today I've been editing the PhD thesis of one of my students. MS word (2003 office) document on a thumb drive. My computer is running Vista.

After saving the document this morning, I got an error message - something about lack of connectivity to the internet or something, I didn't pay that much attention, I thought it was something to do with my internet connection.

After I clicked 'ok' or whatever, the word document closed. And dissapeared from the thumbdrive. There is no document, no word recovery file, no nothing.

The error message may have been Vista or Live OneCare.

Please help! Is there any recovery that I can do?