Whenever I attempted to start PaintShop Pro 9 on a Windows XP system, the program would hang at startup. When I tried to uninstall it, the uninstall routine hung as well. I finally resolved the problem by disabling hardware acceleration for the Nvidia video adapter in the system, though updating the driver for the video card may resolve the problem as well [Update: that is probably the better alternative, since turning off hardware acceleration may create problems for other programs as noted in GoPets and Second Life Won't Run After Nvidia Hardware Acceleration Turned off]
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