I'm having the same problem and I have tried everything.

Deleted both limewire preferences files
Updated Java
I am the administrator
it's not still running in the taskbar
I was able to run it about 3 versions of limewire earlier
I've tried all the other fixes

I am running windows xp on about a T1, I have service pack 2

please fix it! I spent hours trying to get it to work!

reddiestorm