Installing Postgres 8.1 on Windows Server 2003 R2

Hi,

Has anyone tried to install Postgres on Windows Sever 2003 version R2? R2
is actually shipping as a 'new' Microsoft product- it's basically an interim
update to Windows Server (
http://www.microsoft.com/windowsserver2003/r2/whatsnewinr2.mspx)

I've installed Postgres on other versions of Windows with no problem, so I'm
afraid that the error I'm seeing now is related to some great new 'feature'
from Microsoft. Here's the error message returned by Postgres before
install begins-
Error binding the test network socket: 10013

Microsoft Antispyware has been turned off (closed the application) and
Windows Firewall isn't running. There's no other AV or firewall software on
this system yet.

Any ideas on what might be going on?

Jon