Local Users&Groups Doesn’t C Local Admin

I have some workstations that are members of a workgroup. I went to check the attributes of the local administrator account and found that it’s a member of the local users group and the local administrators group.

I tried removing it from the local users group, and got an error message that states, “The specified account name is not a member of the local group.” and yet it’s listed as being a member.

I can login locally with the local administrator account, but can’t login remotely with it.

MSKB and TechNet don’t have anything on this issue and would like to collaborate with my TechRepublic peers to see if anybody has heard of such a thing and might have a solution to it.

Thank you for any assistance you can provide.