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I had the same problem.
For my system it was the incorrect driver.
Vista automatically asigns a microsoft driver and installing the correct driver from the SETUP does NOT change the driver even though it is a successful install.
I had to go to Device Manager in Control Panel and use GET DISK to select the correct inf file in the driver folder.
If you are unfamiliar with GET DISK then google it.
Both the Chicony and DMAX drivers corrected the up-side-down error from the Microsoft driver.