If I'm mistaken I apologize, but it appears that you have a thread on this subject already going over here.

http://www.kixtart.org/ubbthreads/showflat.php?Cat=&Number=129586&page=&view=&sb=5&o=&fpart=2&vc=1

Please discontinue posting to this thread unless this is a completely new suject or issue.

Your issue is being addressed in the other post which appears to be a little more complex then a simple drive mapping from a Domain Controller in a single Domain.