Adobe flash player green screen when playing videos

Hello,

I get this green screen when I play videos on my IE9 browser on a Win 7 (64-bit) desktop computer. This green screen appears when playing a video which uses the Adobe flash player (version 11.5.502.146) but happens only after the an initial portion of the video (entire video is loaded already) is played and the rest of the video is green screen and is played at accelerated rates, as if it was being fast forwarded. The audio from the video is also affected as it plays static of different frequencies.
The videos I've been watching are from http://xin.msn.com/ and http://www.youtube.com/. I've also tried to solve this with disabling hardware acceleration from the flash player's menu, and uninstalling and reinstalling and then rebooting the computer, both of which are different attempts which did not resolve the issue.

Help to fix this issue on hand will be greatly appreciated.

Many thanks