Can´t play videos on new Nvidia AGP cards

Hi there, I know many people have this same problem:

I had an AGP 6600 GT card, and everything worked fine with the 81.95 forceware drivers.

When I switched to later drivers, I couldn´t play videos with any media player at all. The system was almost frozen, and I had to use the task manager to exit the media player.

So I re-installed the older drivers, and everything went back to normal.

BUT…

Now, the 6600 card died, and I just bought a 7600 GS, AGP. Drivers older than 91.31 won´t support this card, so the video playing problem is here again.

I have researched countless hardware forums (even this one), and many people has the same issue with the new AGP cards and the recent Forceware. But no solution was given at those threads.

Some forumers point to power supply unit problems, others to codecs, and others to the AGP drivers for the mother board.

As far as I know, it is a Forceware driver problem. Here is a list of things that I have ruled out:

I think POWER is not the problem: my old 6600 GT AGP would play videos with the older drivers, but not with the new ones.

I think CODECS are not the problem, for the same reason as above.

About the AGP drivers for the mother board, the Service Pack 2 for Windows XP installs Microsoft drivers for that purpose, so my MOBO´s manufacturer stopped providing new AGP drivers, and the last ones it provided – from 2003 – don´t work (I have tried them out, and video starts playing, but the system completely hangs after a moment).

So far, I understand that the new AGP cards are really PCI-express cards adapted to the AGP slot. And the new Forceware has overlooked some kind of conflict or malfunction, that was corrected in 81.95 and before. But I´m just guessing.

I have looked at Microsoft, Nvidia, Aopen, Asus and VIA websites, and this problem is not considered, even though, as I said, many users suffer from this.

I would really appreciate any feedback. If you had the same issue and found the solution, please let me know, or please point me to the link or links that may help.

Thank you very much in advance.

My system relevant specs are:

CPU: AMD Sempron 2800 (2 GHz) (equivalent to Athlon XP 2800)

MOBO: Aopen AK77-600GN (VIA chipset)

OS: Windows XP pro (Service Pack 2)

2 GB of RAM