The format of the specified network name is invalid

I am just configuring SB 2003 on an old SB 2000 box.

I have seven sites hosted on this box.

Most of the sites are the sites that are installed with SB 2003, like MS SharePoint, SharePoint Central, etc.

I have installed and uninstalled ISA on this box. All of the sites are in the same state, STOPPED. I cannot get them to start.

I get an error message of "The format of the specified network name is invalid."
When I check event viewer to see the error I get:
"Cannot register the URL prefix 'http://xxx.xxx.xxx:80:xxx.xxx.xxx.xxx/" for site '1710072957'.
the site has been deactivated.

I have stopped/started all services ( DHCP, DNS, W3Svc ), I have rebooted the machine, I have verified that the only address for the web site is the one I have in the properties.

I have tried to change the ports.

All to no avail. I am stuck. I need this site to get up and moving.

Any help would be much appreciated.

Wherever this is coming from, it isn't a valid url format

Yes I understand that part.
Where would it have come from,and better yet how can I fix it?