Hello!
Try the following:
Use Sherlock 2 and delete everything LimeWire on your system. But ofcourse do not delete the shared folder if you have some files in it.
Now download and install the latest version of MRJ 2.2.5 from Apple. Then after installation assign more memory to it 32000 as maximum setting is the correct value. To download it just search for article id:75097 in Apple's Knowledge Base Expert search.
http://kbase.info.apple.com/cgi-bin/...nD4LYL6dr32Maw
Downlod a new copy of LW and try to install it now. And see if the setup wizard appear.