well i did some search work and was finally able to fix the problem
i installed Z-tweaked drivers ->
here
this is what i did
1> un-installed my video card drivers, reboot
2>intalled them again.It asked for reboot but i opted manual reboot
3>new hardware detect for monitor came up, completed that wizard
3>installed Z-Tweaked drivers, reboot.
problem fixed.
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it was kind of a head ace but i tank u all guys for your precious time.
~DNA