I'd get the MB replaced on the Pfaff 2170. I dislike the newer top feed bobbin machines. The 2170 is a vertical bobbin. I happen to use Babylock Software and bought a separate computer with XP just for crafts, etc. The computer has no internet connection, so I don't have to worry about botnets or malware. I just download updates, etc. thru Ubuntu which has an AV especially for checking these files.