Ideally you would make a fresh install of the OS, then install Mach3 and remember the restart .
put your lic file in the Mach3 folder, then to get your settings from your old installation, go to the old Mach3 folder and
copy the Mach3Mill profile (it’s an XML file) to your new installation, you can also include stuff like the contents of the
macro folder and screen set files.
Once done you should have a clone of the old installation.
You may have to set the screen set again.
Dave