I just discovered a 0 byte file in my documents called Ÿ9Ÿ9. I scanned it with Malwarebytes and SuperAntiSpyware, neither of which found anything bad. When I tried scanning it with NAV, I got this error message:
Scan Error
Unable to open the file. The file is in use by another program or you don't have permission to open the file. Close the file before scanning. If you are still unsuccessful, restart Windows in safe mode and scan again.
I googled it and found a few other people having the same question, but nobody seems to have gotten an answer.
Is this some kind of malware or virus?