In LW go tools > options > bug reports > view example. Scroll down to 'recieved incoming this session'. If it's false, you can't recieve incoming connections & so other people can't download from you.
You need to double check that your Norton firewall's allowing LW & make sure that the XP firewall is off.
You could port forward for the MN 700. The instructions are below.
http://www.portforward.com/english/r...0/Limewire.htm
Make sure to set up a static IP address first

Remember that LW's listening port, the port in LW's 'manual port forward' box & port forwarded within a router all have to be the same number.