I worked in the PC industry designing motherboards. I've installed and uninstalled software hundreds of times. Only a handful would not uninstall when asked to. PDF Creator, version 4. 2. 0, on Windows 10, is one of them. It gives an error rather than uninstall. It was a fresh installation. There is no excuse.
Calls itself a RTF to PDF convertor. Doesn't but installs malware on your computer. It has wrecked my existing PDF files and until now I cannot deinstall it in the usual ways. Wish me luck trying to clean up my poor computer.