1) it might be you need to install the Microsoft Loopback Adapter as "network device"
2) <hostname>A is the "name", registered in the system to listen to CIFS protocol and not interfere with the windows drivers (at least thats what I assume). You need to make sure, your system can resolve <hostname>A correctly. Needs be, extend the "windows/system32/drivers/etc/hosts" file
3) Do not mix up CIFS paths (<hostname>A:8080/Alfresco) and Webdav and Share-protocol paths (<hostname>:7070 …)
4) on Windows Server you need to deactivate some services. Maybe that is similar with Vista ?
Good luck hunting
Norgan