How to Delete an Sql Server 2005 login?

I created an additional Sql Server login, 1 of 3 I am allowed. I want to change the name of this login but i cant so the only option is to delete it.

When i try to delete it using the Control Panel login manager I get an error message saying

"Drop user failed! The user has been granted one or more permission(s). Revoke the permission(s) before dropping"

But there is no user associated with this login. So how do i revoke the permissions? I dont get a logins option under security in Sql Server Management Studio > Object Explorer either.

So how do i delete an Sql Server "Additional" login?


Ive also used a variation on this query :

Select *
From sys.server_permissions
Where grantee_principal_id = (Select principal_id From sys.server_principals Where Name = N'HERMES\bennetp')

to obtain a grantee_principal_id. I get a single record. But if i try to delete it using:


DELETE From sys.server_permissions Where grantee_principal_id = 2001

I get the error message:

Msg 259, Level 16, State 1, Line 1
Ad hoc updates to system catalogs are not allowed.