Video Playing problem

I have a problem playing any type of Video on my PC, My Pc just stops responding whenever i try playing any video. i tried diffirent media players but the problem is the same.
I used the Windows Help center and lowered the hardware acceleration level from the display properties to about 3 points and the problem disappeared. but i can't run any of my games in this state so inow i switch between full acceleration and half acceleration whenever i want to do something. It's getting really annoying. Is there a solution?

PS: I think it's a directx problem although the directx diagnostics says there are no problems in directx.

No, I'm just using VLC Media Player, Which I'm told has his own codecs.

As i said b4 i think it's a Direct x problem although nothing seems wrong

I suggest uninstalling all 3rd party media players (including VLC) and their codecs, then installing WMP 11:
http://www.microsoft.com/windows/windowsmedia/player/11/default.aspx
Allow it to be the default player for all media formats. If this works, then try re-installing VLC.

Also, is your BIOS up to date? According to Nvidia, your BIOS needs to be at least version 0404 to support your 7950GX2.
http://www.nvidia.com/content/geforce_gx2_sbios/us.asp