just came acrross this from lockergnome which may help those with XPhome.

'Whether you're in the military or not, you should salute CptSiskoX for describing a (current) Windows XP loophole. 'Normally, Windows XP Home Edition cannot join network domains, simply peer-to-peer workgroups. However, there is a fix which can solve the problem and allow WinXP Home Edition to join a domain. Microsoft wanted to cripple 'Home' so that it could not be used on domains, which would force many to upgrade to the more expensive Windows XP Professional simply to join a network domain. However, it is possible to get on a domain using the Home Edition. This can be accomplished with the free and widely-available Xteq X-Setup 6.1 by navigating to the 'Network \ Auto Login \ Windows NT/2K/XP \ Settings' option. Simply enter the appropriate information and click the 'Apply Changes' button. On next reboot, you can then join domains with Windows XP Home Edition. Problem solved.' It was noted that the latest version of TweakUI could also do the trick, but seeing as Microsoft has temporarily suspended the download (to 'fix' the oversight), X-Setup is a more viable, short and long- term option.'