You could start by running a search for any of the file names you can remember, see if they're still there. Failing that, search for 'A Word Or Phrase In The file' if you can remember the content of any word of other text files.
It's possible that the virus has deleted or scrambled your doc's but there may still be hope.
When files are deleted all that is actually erased is the label by which Windows finds the file, leaving the disc space free to be overwritten. A good computer specialist will have recovery software which can find any such files which have not yet been overwritten. No idea what it would cost, but you won't know unless you ask.
Finally, get some anti-virus software and back-up you valuable files.
Good luck