There is quite alot of information regarding NT to 2003 domain migrations.


http://support.microsoft.com/default...b;en-us;325851
http://support.microsoft.com/default...b;en-us;260871
http://support.microsoft.com/default...b;en-us;832221

Another thing you can try is ideal administration:

http://www.pointdev.com/us.htm

IDEAL Administration v5.31 makes administration of your Windows NT, 2000 and 2003 domains considerably simpler by providing a single tool that integrates all the necessary features for managing users, servers, and domains.

Further you might want to try this MS document:

http://www.microsoft.com/windowsserv...t4domtoad.mspx

Specific Download Link:
http://download.microsoft.com/downlo...NT4domtoad.doc

Get the OFFICE VIEWER if you don't have office installed:
http://office.microsoft.com/assistan...iewerscvt.aspx