Windows firewall (Ipnat.sys) conflict stopping connections

When I restart my SBS2003 server (with one NIC) I get an error that one service did not start.  The event log says there's a conflict with WF and Ipnat.sys.  At that point no clients can connect to the server.  I have to manually stop Ipnat, and then everyone can connect normally.  I am not even sure what ipnat is but stopping it does not seem to effect things.  However, it is a hassle since it has be be manually stopped each time the server is restart, although normally that should not be often, it still is not right.  There is also something strange going on with WF anyway, because of the following errors.
The Windows Firewall/Internet Connection Sharing (ICS) service terminated with the following error:
The requested resource is in use.

"The Windows Firewall/Internet Connection Sharing (ICS) service could not start because another program or service is running that might use the network address translation component (Ipnat.sys). This can occur when Routing and Remote Access is enabled. If this is the case, you must disable Routing and Remote Access before the Windows Firewall/Internet Connection Sharing (ICS) service can start."

I have tried to stop the RRAS, but it doens not even appear under the Administrative Tools menu.

When I run the configure Email and Internet Connection Wizard it stops when it gets to the Firewall component and asks me if I want to continue, which I do.  Everything appears to be working internally OK, but I don't have any RWA which we use frequently (or at least used to).  I also  am unable to connect internally to the service via  http:\remote\server, which used to work fine.