Moved this to Malware Discussions for better support.
No antivirus, no matter what brand, is 100% guaranteed to stop everything there is out there.
Read the last link in my signature below for some hints and useful tools.
Those symptoms could also be caused by low memory, disk read errors or even old graphics (or other) drivers as well as infection.
Also try to avoid registry cleaners if at all possible as they can mess up a system badly.
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As an afterthought, look in that last link in my signature lower down for Hijackthis or DDS and post the log on one of the forums mentioned there for analysis - they may spot something.
first off sorry for posting it in the wrong section when it asked me about my location i thought it was asking about my physical location "home or office " not the the thread section.
i dont think the problem had anything to do with hardware because my system was working fine a month ago. and after i reinstalled the OS everything went back to normal like before.
As for logs its pointless now because the problem is fixed.
thanks for helping
Useful to know for future use though. Good luck.