. . . . being asked to provide a computr ID . . . .
The computerID is a unique number generated by the program, however this should not be necessary when activating online from within the program
If you are trying to do a manual activation on the Magix website this will only work for those versions of the program that let you activate 'offline', in which case there will be a link in the registration dialog which says something like 'Activate by email' or 'from another computer' to take you through the process of generating the computerID.