Hi, If you previously had a trojan/worm/virus that screwed up cmd.exe regedit.exe and task manager etc, and also caused LimeWire to reopen itself, well I have an easy solution. For starters rune spyware doctor or some other spyware removal program to remove whatever is doing this to you. To get back limewire to normal, you simply go to your c:/program files/Limewire folder. Find LimeWire.exe and rename it, doesn't matter if you delete a letter or rename it completely. After renaming this file, right click it and click create shortcut, then move the new shrotcut to your desktop and delete the old. Viola, now LimeWire once again opens when needed to, not when windows decides to pop it up on you. Also, if you're having trouble getting taskmanager cmd and regedit back, I suggest this thread.
http://www.gnutellaforums.com/general-windows-support/39421-limewire-acting-wierd-please-help.html

Good luck and take care.