I can't believe I have the misfortune of having to use a Windows server for anything.
Fresh install of Windows 2008 R2 (again: SIGH), and ports 80 and 443 are in use. By what?? IIS, Web Deployment Agent, Skype - none of this crap is installed or running. netstat -abno shows something listening on PID 4, but "can not obtain ownership information". PID 4 is the kernel. What? What?
It's the SQL Server Reporting Services. Stop the service and switch it to only be started manually.
Jerks. You're jerks, Windows.