From microsoft site:-
Why does my video flicker?
A variety of issues may cause video to flicker in Windows Media Player. To troubleshoot possible causes, do the following:
•Check for video-card driver updates from the maker of your video card.
•Check for Microsoft DirectX updates by scanning for updates on the Windows Update Web site
•Try a different acceleration setting for your video hardware:
In Windows Media Player, click the Tools
menu, and then click Options
On the Performance
tab, in the Video acceleration
area, drag the slider to None
to use basic video-acceleration settings that work with most video hardware. For some video hardware, you must do the opposite (drag the slider to Full
) to correct the problem.
•Microsoft NetMeeting Remote Desktop Sharing may cause video-performance problems with the Player. In this case, you will have to uninstall NetMeeting in order to improve Player performance. For more information, see NetMeeting Help.
Try updating your codecs:- http://www.DivX.com http://www.Xvid.org
If none of these resolve the issue let me know