Redirect requests to an old server name to a new server name

I have a network that someone else setup.
It is now Windows 2008 server.
The old server name was server1
the new server name is server2

Some of the workstations are running extreemly slow I think because they still have references to the old server name (I looked through the registry and see many references to server1).

is there a way to automatically redirect all requests to \\server1 to \\server2?
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Add a DNS entry for server1 that points to server2's IP?
Use a registry find and replace to change all the references to check to see if that is really the problem.
ie0Author Commented:
What do you mean by "Use a registry find and replace"
Is the a utility I need to get?
I usually just search for one since I don't have to use them often.  I don't know your OS but here's a free tool:

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Automatically delete mapped network printers with your login script:
rundll32 printui.dll,PrintUIEntry /dn /n \\SERVER1\PRINTER

Disable offline files with a GPO.  (Careful, users may still be working completely from cached files on their desktops, which are never able to sync to the missing SERVER1)

Delete defunct network drive mappings
net use X: /delete
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