1. When deploying within a Windows WORKGROUP rather than a DOMAIN network environment you must ensure that the target machines do not enforce Guest access from the network. This is enabled as a default on Windows XP PRO and Windows VISTA.
http://support.microsoft.com/kb/290403 2. The remote installation tool will need to access the remote machines file-system and remote management interface. Firewalls should be configured appropriately.
http://support.microsoft.com/kb/840634 3. The remote installation tool attempts to access the machine using the file share ADMIN$. This is not available on some 'home' operating systems such as Windows XP Home / Windows VISTA Home and an alternative deployment option should be used.