never tried it on a thumb drive, but i always keep a copy of it on my thumbdrive, so maybe try: http://www.snapfiles.com/get/restoration.html
can you download anything at work? (ie: if i uploaded it somewhere else? or emailed it?)
Open a command prompt
type 'debug' and ENTER
type 'l100 2 0 256' and ENTER
type 'd' and ENTER, repeat until you see the file you deleted with @ replacing the first character of the filename
take note of the address of the @
xxxx is the address, y is the first character of the filename
type 'exxxx "y"' ENTER
type 'w100 2 0 256' ENTER
File should be back, in theory
Open a command prompt
type 'debug' and ENTER
type 'l100 2 0 256' and ENTER
type 'd' and ENTER, repeat until you see the file you deleted with @ replacing the first character of the filename
take note of the address of the @
xxxx is the address, y is the first character of the filename
type 'exxxx "y"' ENTER
type 'w100 2 0 256' ENTER
File should be back, in theory