Are you running in windows 8-bit (256 colour) mode?
If so, other programs (and indeed windows itself) could be trying to use the system palette.
Right click on the desktop and choose "properties" at the bottom of the menu. Click on the "settings" tab and choose "High colour" or "True colour" if they are available.
If they are not available, you may be stuck with your problem (untill you get a better graphics card). Make sure you are not running any other particularly graphical programs.
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