Everytime I start my computer a folder called c:\Program Files\Common pops up, containing helper.sig and _helper.sig. I have seen other threads here with similar problems but cannot seem to find the same infected file to delete. I have cleaned my files, run avast which detected nothing (although there were four 'password protected' files it could not scan). My malware, super anti-spyware and HJT logs are attached. If anyone could help, I would be most grateful.