Hey Robert, long time no see. Hows you man??
We didn't see any difficulty going to SP3 way back when, but seems that every time MS comes out with an update, it mucks up my son LW 4.18.x.
NIS2009 definitely Wasn't the issue but all of a sudden showed we had a firewall issue.
I just deleted the Prefs. folder and fetched a new Gnutella.net file and was good to go.
Me thinks MS's Malicious Software Removal Tool has something to do with it.
But that's just me.
Good Luck.