Do you have anything, other than XAMPP itself, set up or installed into this installation?
Was this 'an upgrade' of any sort???
IF not, I would do a fresh download & install from either the .zip or 7z downloads.
If you made any of the components into a service, be sure to remove them as services with the Control Panel or the 'sc delete' command line tool, before un-installing/removing XAMPP.