ESRI ArcGIS 9.3 Windows Server 2008 Unable to change user store

When installing ArcGIS 9.3 on Windows Server 2008, you have to  make sure UAC is disabled. If not, the install will go fine, but when you get to the ArcGIS Server Manager to change the user store to SQL or Windows Users and Groups, it will show users and groups grayed out, and it will not let you change it. Once UAC is diabled, it will default to windows users and groups.

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