OK, here is a fix if you are using Win 98 or ME. It's not as convoluted as it seems..... But why the hell can't ATi get it right without making us mix'n'match drivers?????
Install the 6292 driver set from ATi's web site. Then install ATi Multimedia Center from your original CD. Don't install the drivers from the CD, just the MMC.
Download and install the 631CD25e driver set from
HERE.
After restarting your computer, copy ATI3DRAA.DLL (version 2196) and ATIMCRAA.DLL (version 3032) from ...\windows\system to a temporary location.
Reinstall the 6292 drivers.
After rebooting, copy the two .dll files you saved from the 631CD25 set back into ...\windows\system
Reboot.
You should now have flawless DVD playback, as well as excellent Direct3D and OpenGL performance.
Worked for me...... Much thanks to MasterSurfer at Rage Underground!