Ah , the stupid installer !
Why didn't you mention that before ?
We know some people occaisionaly get that problem ....
Just download the zip file version from the LW site :
http://www9.limewire.com/beta/2.1.1/...ireWinNoVM.zip

This is actually better then the installer version since it doesn't put CyDoor (spyware) on your system .

Or download an completly ad-free 2.1.1 version :
http://users.pandora.be/karel.boonen...Wire_2.1.1.zip