win2000 workstations posting error 529 repeatedly???

I am running a 2003 based domain with all xp clients
except for 2. These 2 other clients are win 2000 pro.
These 2 machines are filling the security event log on my
domain controller with event number 529 "unknown user or
bad password". I don't understand why?

Alittle background, these two machines are both literally
in a vault and used for digital security camara
management. There is no way someone is getting to them.
Also, they both have all the latest patches and I have
not seen any evidence of anyone getting past my
firewall.

Both are posting these error's about 50x a day apiece.
Ideas?

Jim
email --> change jim to james --> (E-Mail Removed)

Aloha, friends!

I'm newbie on network-builders.com . And I realy do not know your rules about writing articles.
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Warmest wishes, me! :-)