installed windows 7 ultimate(tried both 64 and 32 bit) to my pc. but after installation when it reboots for the 1st time, it shows a black screen with the mouse pointer. i waited 1/2 hour but no use. my pc config core2quad q6600, asus P5KVM, 2 gb ddr2 ram, nvidia 9600gt 512mb and 380 gb seagate hd please can some1 help also when i try to boot in safe mode it says that windows have to start normally for the first time. i installed it over xp sp3 by formatting the c drive i have reinstalled it atleast 6 times but no change.