OK, I tried "no" when it asked install, and after it's correct. But it's not very understable, and I must create myself the shortcut. I don't tried remove all configuration's files before, and can't confirmed that the .lng are correctly copy to the AppData of the user account. For the update, an activation of the UAC when you tell "yes" would be a good idea, and next, restart µtorrent in user mode.