Upgrade of Windows 8 has changed my graphics card driver, & now I get vertical bars on the screen.

Upgrade of Windows 8 has changed my graphics card driver, & now I get vertical bars on the screen, sometimes flashing. It is sometimes difficult to use the screen, especially when it has a dark background. It is a HP Desktop quad core with card Nvidia GEForce 9600.  I tried to roll back the driver, but that didn't help. I assume that the driver I need is no longer available. I also went to Nvidia to try to find a better driver that would eliminate this problem, but no luck.  Before, this came with an update on Vista, & I could correct in the way to roll back the driver. Any help would be appreciated.

Go to www.nvidia.com and download the WHQL 306,97 drivers updated successfully.

With the installation of Windows 8, Microsoft provides only the "bare" minimum drivers in order to complete the installation of Windows.

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