Consistant Drops in FPS in Video playback

[Zazool]

Hi this is my first forum post so let me start with my spec

My build is Custom.

Ram - 6GB DDR3 1666Mhz
CPU - AMD Phenom II 6X 2.8Ghz 64bit (untweaked)
Onboard sound
5800 RADEON Graphic 1GB
ASUS M4A89GTD PRO - AMD 890GX
Windows 7 ultimate - Genuine
Display Device - 52" Samsung LCD TV

Here's my problem: the issue started around 2 weeks ago, while watching any Local video media (Not streamed) in any format
videos are frequently dropping in FPS whilst Audio is consistent Frames will return to normal after a few seconds but Drop again moments later.

Here's what I've tried: System restoration to last month, Reinstalled Graphics card drivers, Run Chkdsk /F, Tweaked Video rendering Options for Display device, Set Default options in Graphics options, reinstalled my Media players.
anyone have any ideas other than Rebuild OS?

 

[Zazool]

Problem Solved
In the AMD VISION Control Center settings - LCD digital override settings - HDTV mode support - unchecked these mode supports and this resolved the problem.

PS. Dunno how to close thread