Hallo
First the specs:
Panasonic 37" CRT TV.. not sure of the model number...

I can get that when I get home. It's probably 5-6 years old.
Media PC:
Win 7 Ultimate
Intel P4 3.0GHz
2G RAM
nVidia 7900 GT 256M vid card
S-video connector
So when I hooked everything up initially, it worked just fine. The S-video connection probably wasn't the best quality possible, but until I can afford some DVI/Component adapters and a better TV, it's what I'm stuck with. But, it was still passable, and movies & such looked fine on-screen. I was running at 1024x768 for a resolution, had things all tweaked in the nVidia control panel and everything was peachy. Text was quite readable and everything was nicely anti-aliased.
Then along comes the CCCP Codec pack which a friend recommended. During the CCCP install, it asks me to install/update some DirectX X something-or-other.. I'm sitting close to the screen, so it's kinda blurry... I didn't see if it was DX9 or DX10. When I move farther away, things are easier to read, but I figured it's DirectX and it's required, what can it hurt?
After installing CCCP and the DX whatever-it-was, now my picture quality has gone all to hell, and resolutions that were formerly available in the display control panel are no longer available. From a nice clean picture I've gone to a picture where the whites are BLAZINGLY white to the point of overflowing onto nearby pixels, nothing looks anti-aliased anymore, the screen has refresh flicker issues, and text on-screen is impossible to read at any distance due to jagginess. Changing resolutions and video options in Display and/or nVidia control panel makes no difference.
When I first start the PC, the picture is fine. Up through the BIOS screen to "Loading Windows.." it's perfect. But, as soon as the OS is up and running, picture quality goes down the drain.
I know it's a long shot, but has anybody else encountered this or know what might be wrong?
Thx!
J