kerberos error vista workstations

I am getting the following error from selected Vista workstaions on my domain. I know we have other Vista machines on the network that aren't throwing this error.
Severity: Error Status: New Source: KDC Name: Miscellaneous KDC Errors Description: While processing an AS request for target service krbtgt, the account <username> did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 2). The requested etypes were 18. The accounts available etypes were 23 -133 -128 3 1. Domain: <domain name> Agent: <domain controller name> Time: 7/21/2006 13:15:50
This output is from MOM on our domain controller.
Thanks,
Dan