In LW go tools > options > advanced > firewall config. On that page, you'll see LW's listening port. Change that port to 64049 > Apply > ok. You can also try other port numbers in the range of 49152 - 65535 (eg 65000). Just remember to click Apply then ok to save any changes that you make.

You could also have a read through this thread, there might be some useful info.
Important!!!!!!! A Fix for those whose ISP's block Limewire

Good luck