Consider the following scenario:

• You work with a Windows Vista-based computer that is a member of a workgroup.
• On this computer, you try to access an administrative share that is located on another Windows Vista-based computer.
• The computer that you try to access is a member of a workgroup or a member of a domain. For example, you try to access the C$ administrative share.
• When you are prompted for your user credentials, you provide the user credentials of an administrative user account on the destination computer.

In this scenario, you receive the following error message:
Logon unsuccessful:

Windows is unable to log you on.
Make sure that your user name and password are correct.

If you try to map a network drive to the administrative share by using the Net Use command, you receive the following error message after you enter the correct credentials:

System error 5
has occurred. Access is denied.