Hellow alllll!!!

I got problem: My per-pixel borders won't work in WB5, though I have a recent ATI driver... heres the report:
WindowBlinds 5.0 System Information Report:
STATUS : WB+ SRV+ HLP+ UI+ TRAY+
WindowBlinds is installed correctly on this PC.
WindowBlinds appears to be activated on this PC
Your machine does not support per pixel borders on WindowBlinds skins.
This is because :
Your computer graphics hardware does not support acceleration of per pixel alpha. WindowBlinds requires this for per pixel alphablended borders as without it performance would be poor. Please see if you can obtain new drivers for your graphics hardware. Recent ATI & NVIDIA boards should support this feature. Onboard graphics tend not to.
You have one monitor in total.
(Écran par défaut) 1 is attached to ATI MOBILITY RADEON 7500
Wblind.dll 2005/11/28 14:57:10
Wbsrv.dll 2005/11/28 16:52:00
Wbconfig.exe 2005/11/28 17:19:00
Wbload.exe 2005/11/25 20:30:58
Wbhelp.dll 2004/09/18 16:37:00
Wbui.dll 2005/11/20 13:23:40
Tray.dll 2005/11/02 14:28:26
Could anyone help please???
Thanks