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Maybe you have an issue with your video driver.

If it's a video driver problem you can verify it by
reducing your graphics hardware acceleration
as per the instructions in the following KB article:

(272193) PI: How to Troubleshoot
Graphics Issues
http://support.microsoft.com/?kbid=272193
(scroll down to:  Reduce the Graphics Hardware
Acceleration Setting) (if an improvement is
realized...theres a good chance the you need
to update your video driver)

Go to the support website of your video
adapter's mfg. and search for drivers
compatible with your operating system.

If you don't know the make and model of
your video adapter...check the documentation
that came with the computer.

Also you could try these steps...
Go to...Start / Search...type...
msinfo32    ...press enter.

On the System Information screen...choose...
Components / Display / Adapter Description

You should find the make and model of your
display adapter as well as the driver version.

If the driver on the support website is more
current than the one you are running...
download it and install it. Also you should find
installation instructions at the support site.

After the new driver is installed...you can return
Acceleration to Full.

Good luck.