The witcher problems in Windows 7!!! help needed

[official]

hey guys i am a hardcore fan of the witcher and i thought of playing it again as i could not complete it previously. I hav the normal version and downloaded the EE package from its site..As i heard there was a new patch 1.5 which has new mission i downloaded it. Now wen i installed and updated it to 1.5 there were no problem at all..and it starts off without any problem. Then the opening video starts and finishes but then the screen remains black and nothing happens!!! in order to close it i stop it from task manager..plz any suggestion as how to make it play...i even tried this in Vista 32bit basic and same problem...