all i can suggest is to try resetting it to a pci card and reloading different drivers until you find a set that are compatible
i have a friend who is having the same problem and i get to go fix? it this weekend lol so if you figure it out let me know lol
here are some links i have found searching for answers myself
link 1
link 2
also found this
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My recommendation: uninstall your drivers and hunt down version 1.0 (could be on the CD that came with your card, check the version # on the CD). I know these never gave me any trouble. Alternatively, try the development drivers from support.ati.com I haven't tried them myself, but that would be the next step. >>
i went to nividias faq and found this and it might just be the ticket for you
Q. My TV card has problems with the GeForce. How can I fix them?
Try installing the latest reference drivers. The 5.22+ drivers fix many problems with TV cards and may make the steps below unnecessary.
The following instructions were provided by Bill Ball from Creative Labs, who got them from NVIDIA:
Open the Display properties.
Go to Settings, Advanced, GeForce/TNT/TNT2/TNT2Ultra, Additional Properties, Overlay Color Control.
You can make adjustments or just hit the Default button and hit OK.
Close the Display properties.
The point of this seemingly useless maneuver is that it creates a registry key that you will need IF you have not opened the Overlay Color Control sheet before. If you have, then just skip the above step.
Run Regedit and locate this key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\Display\000#\NVIDIA\DirectDraw
Note: You may have several display entries numbered successively. Usually the last one is the active one, but if you have several that refer to other graphics cards no longer installed, you may want to delete them or run any uninstall for those cards. If you have several referring to your current card and can't figure out which is active, you may want to reboot into Safe Mode, go into Device Manager and remove ALL display driver entries and reboot to reinstall the drivers once.
In the active DirectDraw key create a new DWORD entry called 'VideoBusMasterMode' and give it a value of 1.
Close regedit and reboot
Try the TV card application. NVIDIA says this fixes the ATI TV Wonder and they believe it will fix the Hauppauge and other cards.
If not, run regedit again and look for this entry:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\Display\000#\NVIDIA\DirectDraw\OverlayMode
Change the value for OverlayMode from 0 through 5, restarting and testing the TV application each time.
If this does not help, and you have a card based on the Brooktree BT848 chipset, you can disable Overlay mode until a fix is found by going into the following registry key:
HKEY_CLASSES_ROOT\bt848\Force Primary
and changing the default value from 0 to 1.
Finally, if all else fails, try loading two copies of your TV card application. The second instance of the application may not show the problem. This may be the only way to fix the problem in Windows 2000.
here
it might be direct x 8.1 as noted here:
I installed the card on Win2K. I had done my research before I bought it and had already downloaded the new software for it. It was detected on boot and the software installed with out a hitch. after a reboot I opened the TV program and it scanned for channels. two minutes later I was watching Fox news while I read my e-mail.
Closeing the TV windows was another thing. It would not close without using task manager to kill it. once killed I could not start it again without a hard reboot.
I was frustrated and ready to give up and either take the card out or down grade to 98SE when I decided to try installing DirectX 8.
That did the trick. The TV program now works like a charm. It Rocks!
The only thing I don't like is that I can not record in MP1 or MP2 as I would be able to on Win 98. That and I don't have the Video editor that comes with the 98 version.
hope this helps