my runs perfectly I mostly use my computer to play video games and internet,but since last I reinstalled windows 7 x64(was using the same version before) occasionally malware anti malware bytes and bitdefender antivirus stop working and my pc freezez and i am not able to access control panel or shut my pc down or anything i have to forcefully shut my pc and when i restart it everything works fine.please let me know if I can provide anything else regarding my problem,its my first post on this forum so please forgive me for any inconsistency in my question.thanks in advance.and i will be waiting eagerly for a reply.