Need help figuring out Server 2003 Domain Controller Delays.

I have two DCs on my network.   One is a Windows 2000 and one is 2003 R2.   The R2 is a running as a virtual machine.  The 2000 is a physical pc.   The 2003 DC was just created in the last day to replace a failing 2003 64 bit machine.   I migrated all the FSMO and GC to the new machine, and then demoded the 64 bit server.    I then rebuilt the 64 bit machine and placed the 2003 R2 DC on it running under virtual server.   I now want to demode the 2000 Server and replace its OS with 2003 R2 and convert the AD mode to 2003.   The issues I have is if I turn off the Server 2000 some local users cannot do things that require domain services , also any thing that seems to require a login on the 64 bit Sever takes forever (about 10 minuest to login to windows).  I checked the DNS and that is not the issue as best I can tell as all DC network names resolve instantly.    How do I figure out what is happening?
pamsautoAsked:
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Darius GhassemCommented:
You need to make sure you have another server that is a global catalog. Also, do the clients point to the 2000 server for DNS? Make sure none of the servers do either. Does 2000 have WINS installed on it? Turn off the 2000 machine then do a netdiag on the FSMO role holder and post.
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pamsautoAuthor Commented:
I forgot to add this.   Would demoding the server 2000 forces the requests to goto the 2003 machine?
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pamsautoAuthor Commented:
Turns out it WAS a DNS issue with old records laying in the cache!
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