No not really. Not unless their LW preferences were corrupt. And it might be an idea to delete your prefs. I'm just wondering how you manage to run 2 versions of LW unless they share the same preferences or you log in under a different name. Try deleting your LW Preferences folder whilst LW is closed; instructions here: Fixes for Limewire Make sure you Java is up to date also.

(Well actually I managed somehow to have a user account set up to a different partition.)

Does anybody else have access to your computer?

Not sure about the uninstaller problem. Is that uninstaller or the control panel you're using to remove it. It could be confused with 2 versions of lw on the machine. That happened to me before which is why I haven't tried having 2 versions again.