longen - 7:33 pm on Nov 2, 2006 (gmt 0)

I had the same problem in 2002.
I recall creating a new Folder, moveing the .exe into in, and then installing ok.
But i can also remembering doing a Format, and clean install of XP around the same time.
Try running some cleanup utilities + refrag to see if it helps, but you may have a corrupted OS.