If you are getting a "file missing" message on bootup, what you need to do is remove "Client for Microsoft Networks" in the Control Panel Network applet. If that resolves the error, you could leave Client removed if you are not networking and have no need for Network Neighborhood. Otherwise, just go and add it back and one way or another you should be rid of the annoying message.
You will need your Windows CD or to enter c:\windows\options\cabs when prompted for a disk for reinstallation.
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