(replying to own previous topic, and suggestions from others; sorry if breaches etiquette)
I've uninstalled MJ8, and gone thru the registry, deleting all keys with 'JRiver', 'J River', 'JRiver', 'JRiver', 'MediaJukebox', 'Media Jukebox' (yes, all of these - around 100 entries left behind: no wonder registry gets so big).
I've then tried reinstalling 7.2; after restarting Windows (XP, incidentally), I try to run MJ7.2 (it's on the Start Menu, etc.). I still get 'Failed to initialize registration control', then terminates.
If you instal 8 (albeit beta), does this then prevent you from using 7.2? (8 does not have a Basic version, so you have to buy it after 30 days' trial, whereas I want to revert to 7.2 Basic).
If so, is this a dubious practice?
Ah well, MusicMatch Jukebox here I come (one highly dissatisfied user)