This issue is solved. Problem is with drivers. I used safe mode and installed drivers as one of friends instructed me.
But I am having another issue, when watch movie in full screen (23 in Samsung LED monitor - SyncMaster S23B370) there are little horizontal distortion lines occur sometime. Only few lines visible in 3 inches from bottom line of monitor, it is not continuous process. It also happend in onborad VGA. But not in my earlier monitor 15 inch Philipes CRT. Only happend in full screen mode Videos. Not even when playing Games.