It's the installers fault .
I know allot of programs that for whatever reason misdetect IE6 .
Mostly because their not updated and don't know that IE6 is out .
And only detect up to IE5 .
Ignore it if it allows you to continue .

If you can't get it to install try this one :
http://users.pandora.be/karel.boonen...s/LimeWire.exe
It is version 2.1.2 with no ads or CyDoor .