Hi Kissling,
The <your profile>.xml file within the Mach3 folder (typically Mach3Mill.xml) contains all the Mach3 settings. This file can be copied from the original installation to a new installation. You may also need to copy over the Macros folder and any special screen sets if you are not using the standard 1024.set. Also the Mach1Lic.dat license file.
Tweakie.