Solve : odd colored sqaure?

1.	Solve : odd colored sqaure?
Answer» This question was asked of me by a friend. This is all the information I have. Hope you guys can help. When ever I have my paint shop pro open. a color square will be LEFT on my desk top after I have closed it down ,some times it is right over something I need to GET to, Is there any where I can go and fix it so this won't HAPPEN? I run XP home edition. I've SEEN this before but I can't tell you what causes it, the first thing that springs to MIND is update your video drivers from the manufacturer's website. Updating Windows should also go without saying.

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