from my how to join a domain post
here what I did. it is almost exactly how you had it. Now I can join a domain. Can I name it whatever I want?
Insert Windows XP CD.
Start > Run > X:\i386\winnt32.exe /cmdcons
(replace X: with the appropiate drive letter)
Acknowledge prompt by clicking 'Yes'.
Skip updating process by clicking 'Cancel' or by pressing 'Esc'
After installation, acknowledge success msg. by clicking 'Ok'
Start > Shutdown > Restart
At boot menu, select 'Microsoft Windows Recovery Console'
you now have text mode options