Weird video playback lag.

Hi all,i have a problem with video playback (source is irrelevant,because it is the same on all except on one i will explain later).
Namely,when i watch a video (youtube,vimeo,imbeaded into random site,veetle & even video playback in games {which is not rendered ,but is indeed a video file} i.e during cut-scenes etc) i get a strange glitch,the video starts behaving like it is running at ~5fps (in other words,starts to lag)[ like it is displaying every 4th/5th frame instead of the usual 24-40fps.] really odd.

The problem with the video "lag/glitch" isn't immediate upon starting the video playback,but around 60s-90s after start ,and after pressing any key on the keyboard or moving the mouse around it starts behaving normally again,then again after 60s-90s ... the cycle continues over again

It is not the internet connection,since i have the same bug in the in-game footages/videos.

I have not made any major/or even minor changes to the VGA drivers/system/video playaback drivers/codecs/etc. nor have i made any recent installations/installations.

The problem started a couple of days ago.

Windows 7 32-bit.[unmodified in any way]

mitchell65 said:

Try a system restore to a point before the problem started!

Just did,no dice.