hmmm....does this happen with any other programs you download and then try to run?
read the following and then run chkdsk after you have figured out the proper commands...
How to perform disk error checking in Windows XP
if that fails then try a virus scan...
if that fails...well, the only other thing I can think of is that you might have your machine improperly overclocked and that is causing some issues...
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So Long and Thanks for All the Files
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Beware of the big 3 insurance companies in Texas! Read your policies carefully (maybe you'll need a lawyer) Allstate, Farmers & State Farm are overextended and their 'coverage' is worthless...a true waste of your money
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