Problem with video card driver (no videa in media players)

Edit: Solved, the person that did the repair didn't know what the problem was but it's fixed now  

Hey everyone, I have a problem with my video driver, and I hope someone here could help me. I will try to give as much details as possible.

- I have a NVidia GeForce 9600M GT video card and installed the latest drivers; and Windows Vista 32-bit on a laptop
- When playing a video file on any media player; all I get is a black screen (though audio works fine).
If I disable the video driver, load a video, pause it and then enable the driver again; I get a video; however the quality is only decent for low quality videos and in Media Player Classic I don't have subtitles.
When I uninstalled the video driver I had perfect video quality in MPC even for high quality videos; however I don't have subtitles (the error message I get is: CreateDevice Failed, Error Code 0x8876086A, DX9AllocatorPresenterFailed, D3DERR_NOTAVAILABLE)
Btw streaming videos online does work; however not in fullscreen mode.
- Windows picture gallery (or whatever it's called in English, it's the default program that opens picture files in windows) doesn't work either - however the slide shows do work
- Games don't work either (The only game I tried is Touhou, but I found out it only doesn't work in windowed mode); since I don't game often I'm not sure about this one; some/many games might work.

I really hope someone can help me fix this problem, if you need more information please let me know I will try to provide it.

Thanks,
Bas