Uninstaller commands going AWOL

No matter what program I click to uninstall, it gives the same error; An
error occurred and it may already be uninstalled. It asks if I want it to be
removed from the list, but even if I click yes it's still there.

That part is regardless because I already know my programs, say Firefox,
work just fine because I'm using them to TYPE this.

Something's wrong somewhere {sighs}

Any thoughts?