Try running it in DirectX 8. My example uses Guild Wars. Like this:
1. Go to your desktop icon and right click it.
2. Select Properties.
3. Make sure the shortcut tab is selected.
4. Next to target u will see "C:\Program Files\Guild Wars\Gw.exe"
5. Change that to "C:\Program Files\Guild Wars\Gw.exe" -dx8
If that doesn't work ask them for support. The Guild Wars support team works very fast. At least with me they did. I hope this helps.
