I've got the same problem
I disabled my firewall completely but it stays on sp.ico
So i tried leaving firewall on and making it an exception which i obviously should of done first but it still doesn't work! Garr!
HELP!
Stats:
Windows XP
MSN Messenger 7.0.0429
MSNPlus 3.50.124
StuffPlug-NG 2.1.243
Firewall: Yes
SPNG Exception: Yes
Router: Yes
That enough info?