T400: Ati driver causes freezing screen - help please

i have a t400 with win 7 64 bit ..but when i finsh the  instalation of ATI driver i got a freezed screen ..does it a driver problem or the ATI itself damaged?? if not how i can fix this problem ?? i  tried all the possible ways of instaltion the driver by windows update , by install the last version driver from lenovo and AMD..and all i got the same problem !! help me plzzz 
sorry for my bad english
Moderator Note: Edited subject to match content.

Before you updated the driver, what version was installed? What version are you installing? Is the switchable graphics setting set to high-performance? (turns graphics chip on) Also, make sure you have the latest BIOS. With 64-bit, I always suggest updating BIOS from bootable CD.

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