Op, what u wanna do is. Install 1.7.2 in a location eg: folder off desktop. use the registry crack i sent you, and then when you're done. Replace the ms3d.exe and the .cfg file with the original ones from the install on dekstop, that may work. You can then just remove 1.7.2 from desktop then. Run it and use Keygen, if it acts as if its your first run. Good Luck EDIT: Don't use those files from a 1.7.4 if ur version is 1.7.2, make sure the files match the version.