Recently my computer got infected with win32-generic virus. It spread to most of the executable files on my hard drive. Since i couldn't find proper solution to remove the virus ,so i recovered my OS to an earlier system image.Later i installed a clean download of AVAST free anti virus and ran a quick scan which did not reveal any virus. when i tried to scan the drives which were not affected by the system recovery , the win32:malware-gen ,win32:DROPPER-KQQ and win32:sality viruses were revealed on many exe files and avast was unable to repair it....but same folder scan using malwarebytes didnot show any infections..plz help...