Thanks a lot fro response razy60.
As soon as I uninstall the driver
I have now installed, it is asking me to reboot the system, after restart i will automatically install AMD driver from Microsoft (which doesn't include OpenGL adn I can not run certain games! but oddly the video playback will work with all video players!). And if I try to install the older version of AMD driver over the Microsfot provided one, it will "refuse" to install ! and by "refuse" I mean in the Custom option of AMD installer it wan't show up the "Display driver", it shows only AMD Control Center and some other soft from AMD installer.
Can you pleas tell me what could I do now?
Thank you very much again