Iam using HP pavilion dv6 6119tx laptop i have replaced my motherboard recently.now i have installed windows 8 64bit operating system. my system hangs frequently iam unable to play videos and music.i cant even use internet that it takes more time to open the browser. copying things also got slower.i ran both primary harddisk test and memory test using bios.both test resulted in pass state.i ran sfc/scannow using cmd it showed no integrity violations.i have scanned my system for viruses using eset it could not find any virus.please help me with a solution.
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