Request an application to run elevated one time

In Windows Vista, UAC and its Admin Approval Mode are enabled by
default. When UAC is enabled, local administrator accounts run as
standard user accounts. This means that when a member of the local
Administrators group logs on, they run with their administrative
privileges disabled. This is the case until they attempt to run an
application or task that has an administrative token. When a member of
the local Administrators group attempts to start such an application
or task, they are prompted to consent to running the application as
elevated.

1. Start an application that is likely to have been assigned an
administrative token, such as Microsoft Windows Disk Cleanup. A User
Account Control prompt is displayed.

2. Verify that the details presented match the request you initiated.

3. In the User Account Control dialog box, click Continue to start
the application.