Hi PratikPatel - (1) You might want to got to the AMD/ATI site and download the Vista
Drivers and the Windows 7
drivers, in seperate folders so You can install and uninstall w/o being confused - Once You are in front of the box - Video problems can be nasty -- but You can doit :-)). (2) Uninstall the Video
driver You have now. (3) Select the Microsoft VGA
driver and install it even if You have to do it in the Safe mode. (4) When You have the Microsoft VGA
driver installed, and You get back to the desktop -- Install the Vista
drivers, if everything is good then You re-evaluate the next step. (5) If it is not good then You try the Windows 7 drivers. If that isn't good then install Microsoft (I think it is call WDDM driver). (6) If none of that works then Wow maybe the Hardware itself is bad????
Happy Hunting!!! Patrick C