Strange Full Screen Video problem

[DrkHelmet]

Ok, this has me puzzled and I have been unable to find anyone posting the problem, let alone the solution. Here goes:

I have a GeForce FX 5800 Ultra, which has 3 video outs. It has standard monitor output, S-video, and a slot for HDTV. I'm trying to run it in dual output mode in clone format, monitor + S-video hookup. Now, the fun part. When I run a video, I want it to run full-screen on the TV, which it does. The first video (regardless of size, resolution, or length) plays flawlessly. As soon as I close that one, I try to open another video (again to play on the TV), the TV output turns a solid green, and the video playback on the original monitor skips fiercely, along with the sound.

After setting the display back to single, and then switching back to the previous clone setting, 1 video file will play perfectly again. Then, the same effect after that finishes and I go for a second.

So far:

I have booted into safe mode and removed monitors/video card and reinstalled completely.

I have tried running various dual monitor formats, Clone, DualView, and Horizontal/Vertical spans.

My GPU is running at nominal temperature. It is not overheating.

I am running an Athlon64 3000+ (2ghrtz). 512mb of DDR RAM. It is slightly low on RAM I know. I had to send my last stick back.

If you need any other information, let me know. I have recently reformatted, so it's not long dead lingering software. I have also scanned for viruses and spyware. My system is clean.

[Faram]

Seems like a grapics driver hang, try to update the nvidia driver and do not use the one from windows update.

[DrkHelmet]

Seems like a grapics driver hang, try to update the nvidia driver and do not use the one from windows update.

I am using the latest Nvidia driver from the Nvidia website.