I seem to remember lowering the hardware acceleration in the DircetX control panel might help this...
If it doesn't you can turn it back up...
I could be wrong though...

unfortunately didn't work

Doh!
Specifically hardware acceleration for the sound!
I forgot to mention sound...

tried both GPU and Audio, didnt help. I think it must be something with gpu since software mode works fine

What video driver version are you using? The very late NVidia Win98 drivers are riddled with issues.

Its an early one 23.11, tried many out, but until now it works with all games. Only 3dmark 2001 doesnt want to wirk with it.

Tried a bit newer driver, now its ok, but the other games wont work...