If you’re receiving an Access denied error when attempting to run an stsadm command under Windows Server 2008, user access control is likely interfering with the application.
Instead of opening a command window by simply double-clicking the shortcut, right-click the shortcut and select Run as Administrator (even if the logged on account is already a Windows administrator); alternatively disable UAC.
Thanks for taking the time to post this up. My solution was to save the stsadm command as a *.bat file, right click, and then run as administrator. So a simple twist off of a simple post, but this was actually blocking a pressing production install. Reminds off for want of nail: http://en.wikipedia.org/wiki/For_Want_of_a_Nail_(proverb)
Arlington, VA, USA