You probably have captured uninstall info in the registry under HKLM\Software\YourSoftware|Uninstall or something like that. To make sure that this is the issue, go to the Add/Remove Programs section of the Installation expert and check the "Do not display in Add/Remove Progs" radio button. Compile and install. If you see anything in Add/Remove progs, it means u have unwanted entries in your registry. Go hunting, take them out, then when you have cleaned it all out, recheck the "display in Add/Remove" radio button.
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