Please change your driver to the latest version (7.70-020418M-003815C
), get it here.
English Version: http://download.ati.com/drivers/w2k...01-6071-efg.exe
Multi-Language Version: http://download.ati.com/drivers/w2k...-13-01-6071.exe
You also need DirectX 8.1 to use those drivers.
Hope this helps!