Hi Brian,
This is a major change in Windows Vista. Although the user may be part of the Administrators group, they run in standard user mode. When a system-wide operation is performed, the elevation dialog is shown. In case of legacy applications (that don't have the requireAdministrator flag set in the manifest), the user need to right-click on the program and choose "Run as Administrator".
See also:
User Account Control Overview:
http://technet.microsoft.com/en-us/w.../aa906021.aspx
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Regards,
Ramesh Srinivasan, Microsoft MVP [Windows Shell/User]