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"I have resolved the problem on my own. The problem is with Norton 360 v. 3.
Norton is currently working on a patch. For now, the workaround is as follows:
Start > Run > Cmd
>cd "\Program Files\Norton 360\Engine\188.8.131.52" (use the quotes)
>regsvr32 /u buShell.dll
You should then see a message saying that the module is unregistered. This disables the Backup Program in Norton 360.
Paint Shop Pro should now launch as normal."