Open up your case and reseat your graphic board. If this doesn't fix your problem then your graphic board has an issue. Unless you are using a top of the line graphic board then you would be better off replacing the board rather than trying to fix it. Most cards would have to be sent back to the manufacturer, and unless you have a warranty on the card the labor charge of $80-$100 an hour would end up costing you more than the card is worth.,
Windows 8 Release Preview works great on the same hardware that powers Windows 7:
Processor: 1 gigahertz (GHz) or faster
RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
Hard disk space: 16 GB (32-bit) or 20 GB (64-bit)
Graphics card: Microsoft DirectX 9 graphics device or higher
Additional requirements to use certain features:
To use touch, you need a tablet or a monitor that supports multitouch.
To access the Windows Store and to download and run apps, you need an active Internet connection and a screen resolution of at least 1024 x 768.
To snap apps, you need a screen resolution of at least 1366 x 768.
be careful not to copy it over the current operating system you might use another hard drive or create a partition
if you download the review
http://windows.microsoft.com/en-US/windows-8/download
hope this helps
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