This is just a guess, so no offense if it's wrong
......Are you sure you aren't starting LW with the installer called "LimeWireWin.exe". Possible you d/loaded LW to your desktop and are using the installer to launch it, which would cause you to go through the setup each time
.
After you install LW there should be a shortcut on your desktop called "LimeWire PRO 4.12.x". You should use that shortcut to launch LW. If that's not it, post back
.