Can't delete GPO printer assignment from old domain

I have taken a group of PC's and disjoined them from their original domain and joined them to a new domain/new forest.  While in the original domain the PC's received printer assignments through GPO.  In the new domain the printer assignments are being made manually.  The problem is that now after each user logs in (using user names that didn't exist in the old domain) printers from the old domain are appearing 30-60 seconds after login.  The domain controllers for the old server have been shut down and the print queues are no longer active.  Any attempt to access the old printers results in a long delay with an eventual timeout.  I have repeatedly deleted the old printers, but they return at the next login.  Presumably the PC's are getting printers through the old GPO configuration -- but how can that be after disjoining the old domain and shutting down the old Domain Controllers?

Help!
billtaylorAsked:
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X_layerCommented:
Well do a RSoP and see which GPO pushing printers on machines. Also verify that no login script is running for this new users.
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billtaylorAuthor Commented:
I did an RSoP and it did not show any printers being pushed.  All users share a single login script that does not reference the old printers.

On each of the affected PC's I wound up searching the registry for the name of the old server that had managed the printers and deleting every instance.  I had to do this twice since entries that I had deleted reappeared on a second search a few minutes later.  After doing this and rebooting, the old printers finally stopped appearing.  It has now been over a week since the registry edits and none of the PC's have shown any ill effects due to the edits and the phantom printers have not returned.
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billtaylorAuthor Commented:
Only one response was received and it did not resolve the problem.
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