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I have been scouring the forums trying to get this issue resolved to no avail... please help 
Im running a Sony Vaio VGN-SZ430N with GeForce Go 7400, and just upgraded to Win 7 Ult 32 from Vista Biz 32. After the upgrade everything appeared to be working fine, but now i have backlight issues! The hardware is fine, and as the laptop boots the POST Screen is normal and the "Windows is Starting" screen is normal, but when it passes that to load the desktop - the backlight shuts off!!!! If i uninstall the display driver (says its the Geforce Go 7400), and reboot, Win 7 loads the standard VGA driver and the backlight is normal, however max resolution is 1024xXXX.
I have downloaded the WIN 7 32 Bit Drivers From NVIDIA (179.48), and installed them - and after reboot it worked great. But if i shut down or restart again.. its back to the same problem!! (NOTE:The VGA out/external works properly.)
It seems like when the system reboots that 2nd time its reverting to the old, non-functional drivers... anyway to delete all the old drivers or stop windows from reverting back to the old set?
Thanks,
Luke

Im running a Sony Vaio VGN-SZ430N with GeForce Go 7400, and just upgraded to Win 7 Ult 32 from Vista Biz 32. After the upgrade everything appeared to be working fine, but now i have backlight issues! The hardware is fine, and as the laptop boots the POST Screen is normal and the "Windows is Starting" screen is normal, but when it passes that to load the desktop - the backlight shuts off!!!! If i uninstall the display driver (says its the Geforce Go 7400), and reboot, Win 7 loads the standard VGA driver and the backlight is normal, however max resolution is 1024xXXX.
I have downloaded the WIN 7 32 Bit Drivers From NVIDIA (179.48), and installed them - and after reboot it worked great. But if i shut down or restart again.. its back to the same problem!! (NOTE:The VGA out/external works properly.)
It seems like when the system reboots that 2nd time its reverting to the old, non-functional drivers... anyway to delete all the old drivers or stop windows from reverting back to the old set?
Thanks,
Luke