Server 2008R2 AD. I did a fresh install of Windows 7 SP1, joined the domain, rebooted, but the computer is not showing under Computers OU. Computer logs-in to domain without a problem. Did wait long enough to confirm the same. Same happened on fresh install of XP SP3 with the same computer. Did a search in AD for computer name to no avail. Computer gets IP via DHCP running on the server and registers with DNS. This is a multiple DC/DNS/DHCP server LAN each on its own subnet and its own DNS/DHCP server.