Need some help with Nvidia troubleshooting...?

I have a GeFroce 6800 and for some reason, ANY video I play comes out REALLY dark. I tried playing with the video settings for the video, to no avail. Then I tried messing with my video card settings, particularly the video display settings. If I just move a bar on the control panel to increase gamma per say, my video comes out perfectly. This is without actually pressing apply either. But I have to do this each time I open up a video. Is there anyway to get this setting to stick?? The settings are fine, they just apparently don't apply until I bring up the control panel and change a setting.

Additional Details

2 weeks ago
It doesn't matter, ever player, real, windows, quicktime, they all have the same problem. And I've hit apply for my settings quite a few times. I need a little more than just that....By DarkWolf_...

hmmmm... now that's something I haven't seen before. I have a Geforce 6600 and I've also had vid problems, but it's usually they play, or they freeze the computer completely.
For me, it was an issue of drivers. The tech guys at Asus told me not to use the enhanced display drivers for these cards (but I don't remember if that was an asus thing or an nvidia thing).

A friend of mine tried to help me by updating my drivers and it actually made it so that I couldn't view any vids at all. so I had to roll-back.
Sorry if I'm not being much help, I'm thinking... and trying to give ideas... um.... well, ok, so if you changed the vid settings and hit apply and ok. then restart? make sure that they stick? I noticed that the system doesn't save settings if the comp freezes and you have to do a cold restart.

That's about all I can think of at the moment.... best of luck! :)

Thats my one pet peeve with nvidia cards! I have been through a dozen of them and every one is the same! I like some of their features such as stereo graphics drivers but I finally went to ATI! The graphics are much better! The best you can hope for is to adjust your monitor contrast and brightness.