Version 3.3 (on Windows 10 - 64 bit) installs fine, and uninstalls the older version 3.2.1. Upon starting Cura 3.3, I see the logo splash screen and the changelog window, which then shuts down Cura. No orphan executables, nothing in the Windows logs.
Have uninstalled/reinstalled, and restarted Windows, but with the same result.