The subdir does not exist then is gone. Now open regedit and search for windows\system32\config\system Uncheck Keys and Values. Delete all ocurrences if any. Use CCleaner and scan for issues. Do you have an autorun.inf file if then is post its content. [add'l] Explore Documents and Settings\Administrator, All Users, other user names (depends on your pc) if it contains any .exe with a gibberish name move it to a zip file as backup. For example if it contains something like 868378080.exe search your PC for that file and delete it. Otherwise I guess your PC is clean.