I had found a better list with definite settings, but I have no link, only a HTML file saved on my disk. And Windows Messenger is not Messenger service. While WM is vile enough and should be get rid of, it's the service that makes the spamming pop-ups possible. Then, things you dewfinitely don't need and can set them to Disabled: Alerter Clipbook Messenger NetMeeting Remote Desktop Sharing Network DDE Network DDE DSDM Remote Registry Routing and Remote Access Server Telnet and possibly Terminal Services, as well as Fast User Switching. That's just for security. You can try setting some other services to Manual, if in doubt.

-- erlik