HELP : T500, External LCD monitor problems, after upgrading GMA4500MHD display driver!

I have upgraded my display driver for GMA 4500MHD from version 7.15.10 to version 8.15.10.1968 (Vista 32bit).
After the installation and rebooting of the T500, my brand new Samsung SyncMaster2233BW cannot show correct display image.
Only image I can see is white screen with few blue shapes. I'm using VGA output for connection. I have tested the monitor by connecting to my other laptop (Dell D620) and everything works fine.
Can somebody help with this strange problem? How can I make my external monitor work again with
T500? Is it possible to find and download display driver version 7.15.10.xxxx somewhere and revert back?
T500 configuration: 15", 3GBRAM, 320GB HDD, Vista 32bit (Home Premium, SP2)
HELP, HELP, HELP

Hi sehu,
Can't you just ask Windows to roll back to previous installed driver? Additionally, have you tried going back to the point where previous version of driver was installed through Windows System restore?
Also check in c:\swtools\drivers\video folder to see whether or not the desired driver resides there.
Hope it helps.
Maliha (I don't work for lenovo)
ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
IdeaPad: U350
Apple:- Macbook Air [Snow Leopard]
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