The user don't have to uninstall the old application before installing the new one, unless the old application used the registry to save information and the new one don't use the same key or you used an ActiveX in the old version that isn't used in the new version. In that case, yes it's better to do an uninstall first so that the machine get cleaned.

If you just made a small change in the application (didn't modify any access to the registry, didn't add new ActiveX controls), then you can only distribute the new EXE to copy over the old one.

HTH

>I have been using the Setup Wizard to create an installation program. For performance reasons, I have been installing the app directly on the user's local drive.
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>When distributing revisions, can I have the users re-install the app right over the old one or should I have them uninstall the app from Control Panel first? If we do re-install right over the old copy (and I am sure it has happened), do we end up with a lot of garbage in the Registry (or does SETUP take care of this for us)?