During a logon attempt, the user's security context accumulated too many security IDs. This is a very unusual situation. ...

Windows Server 2003

During a logon attempt, the user's security context accumulated too many security IDs. This is a very unusual  situation.  Remove the user from some global or local groups to reduce the number of security IDs to incorporate  into the security context.
User's SID is %1
If this is the Administrator account, logging on in safe mode will  enable Administrator to log on by automatically restricting group memberships.

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