Messenger Spam

We run NT at work. When we get our new CRM software, we are looking at new PCs for everyone. Our sysops want Win2000 because they don't trust WinXP. Get over it, I say!

But, running XP at home, I find a potential problem. Even with the internal firewall on, an outside user (ie spammer) can essentially create a pop-up ad on my screen at will using a little used "Messenger" service. I'd hate to have 10 guys on my back about how to stop this spam, which would be the case if we had the XP machines already. Here's the straight dope:

TechTV-how to turn Messenger off