If you try to play MXO on a fresh reinstall, or friend's install, you will be missing all your blips, hotbars, loadlos, et cetera.
The solution is to either burn on a cd or place on a usb device your "/The Matrix Online/Profiles" directory. The cfgs and xml documents in that folder hold your settings, and you'll log on with hotbars and the like
Just a little tip, as I wiped my hard drive today and it came to my mind.