Lag in WMP and Flash

Hi peeps been a long while!!

I recently started getting lag in full screen whilst watching flash live streams particularly the JWPLAYER which a lot of live streamers seem to prefer now. Youtube and such has been fine. Although flash has had its issues with Chrome etc, but I get around that sometimes with an older flash version.
BUT now I cannot play Youtube or any flash video without lag in small and full screen. I can't even watch my WMPlayer in full screen now. But I can watch VLC and NERO in full.
So corrupt drivers I thought. I have reinstalled the video drivers (radeon 9600) But it is still the same.
I am on XP.

PLEEEEASE HELP. Thanks in advance!!!!!!!!!!