You probably have two copies of Appwiz.cpl (e.g. Appwiz and Appwiz(2)...) in your System32 folder. If it's the case, delete (2) and reboot the computer.
If programs are populating when you have version 1 and 2, try deleting #1 instead now. But, don't empty the Recycle Bin in case we need to restore it back to the System32 folder.
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