Whenever I go go advanced tweaks/ video tweaks and turn DXVA_WMV to on ( in ATT), the WMV acceleration in the control panel turns off. And whenever I turn WMV acceleration to on, the DXVA_WMV is the advanced tweaks turn off. I have a 9800pro and I think this bug should be fixed.
There is a bug in "Video Tweaks" datatabse Open Database folder inside ATT main folder. Find "Video Tweaks.dtb" and open it in notepad.exe. Locate this Value5=DXVA_WMV,DXVA_WMV,1,0,0, and change it to this Value5=DXVA_WMV,DXVA_WMV,0,0,0,