4cstr,
No need to make multiple posts, honest !
Try the other thread where you posted before and look for the instructions about
how to remove LimeWire...
Probably you simply need to properly remove LimeWire first...
Then, reboot and install the 3.6.15...
you can download older versions of limewire since 3.0.1 from
http://www3.limewire.com/download/
Then reboot again and try it ...