Access Denied When Running STSADM.exe

A client of mine had installed MOSS 2007 on Windows Server 2008. When I tried to run any stsadm command on the server, I would receive an Access Denied message with no other details.

The answer to my problem was to disable User Account Control (UAC), which is enabled by default on Windows Server 2008 (as well as Windows Vista).

Detailed instructions on how to disable UAC can be found here. I used method #1.