now I've got a question regarding the uninstaller.

I have installed version 1.00 of my program. In the list of programs that are installed on the computer, it looks lk this:

In the installer that I'm creating for the next version 1.01, I want the user to be prompted to uninstall version 1.00 before installing the new version. So I added the following entry to the setup for version 1.01:

However, running the created installer for version 1.01 does not prompt me to uninstall the existing version 1.00 (Windows XP Pro SP3 x86).
Am I doing something wrong? Thanks for any help.
Best regards, Juergen