Problem in "Add or Remove Programs"

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I have windows XP and am having a very strange situation when I go into "add
or remove programs." There is a huge space that is black and is located
somewhere in the middle of the list of programs. So far I have removed the
program directly above the black area, checked for viruses and spyware, and
looked at any recently added programs. I have been unsuccessful in
resolveing this problem. Has anyone ever encountered this before?!?!

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