cannot join domain - Error 1326

I am attempting to connect a laptop running Windows 2000 SP4 to a Windows 2000 Server and when attempting to join its domain I get Error 1326 which is: "Logon Failure: Unknown user name or bad password".  Another laptop I have works just fine when joining the domain. I compared the laptops and they have the same Network settings (similar IPs, same netmask, same gateway, same DNS entries). Also I compared local security policies on both laptops and they are the same.  The event logs are not reporting any information when I attempt to join. I'm pretty sure the laptop that isn't working used to connect to the domain fine in the past. What else would have caused it to quit working?

thanks
guid

P.S. I can ping the other laptop and the server both with the IP address and the name so DNS appears to be working.
LVL 12
guidwayAsked:
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guidwayConnect With a Mentor Author Commented:
Someone I e-mailed suggested I check the LMCompatibilityLevel flag in the registry to see that it was set to 5. It was set to 0 and when I changed it to 5, everything worked.

Requesting CS to close this question.
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tztrhCommented:
try this.
Under Administrative Tools:
LOCAL SECURITY SETTINGS
LOCAL POLICIES
SECURITY OPTIONS
Network Access: Sharing and security model for local
accounts.
Change from "Guest Only..." to "Classic - local users authenticate as themselves"
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modus_operandiCommented:
Closed, 250 points refunded.
modus_operandi
Community Support Moderator
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drapercityCommented:
This fixed my problem also.  I had a Windows 2008 x64 server that all the sudden would not authenticate on my domain.  I removed it from the domain and could not put it back.

This problem started when I installed Symantec Endpoint Security on the server.

Setting this registry value to 5 (it was blank) fixed my issue.
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