Thanks for the prompt reply! It is a Billion 740GE/741GE.

Since posting, I have taught myself about the Registry and regedit. As a result, I have managed to unhide the Advanced tab by changing some of the registry values. It was showing as uncleared - I then proceeded to set up the two Gnutella services as suggested. While I got a sense of achievement in all of this, unfortunately it hasn't seemed to help, although I am about to clear those services and restart.