Digital Machine Certificate - Win XP Pro SP1

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I logged in a PC as USER1 and registered a certificate under
"certificates (local computer)". Now as USER1 I get authenticated when
I logon. Then I tried logging on as USER2 and cannot get
authenticated. I looked and there were no certificates listed. I
thought once I registered a "Local computer certificate" it would be
available for all users.
I need a way to register a certificate for the machine. I cannot
register certificates for every user that might logon to each PC. I
also cannot do autoenrollment.
Any assistance would be greatly appreciated.

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