Office 2007 TR - Outlook Not Installed For Current User Error

After a fresh install over the weekend with Vista RC2 and Office Beta 2 TR I kept on getting a very annoying "Microsoft Outlook Has Not Been Installed for the Current User" error. This despite the fact that I've installed Office for all of the one users on the machine and Outlook have never been opened so the KB article dealing with a related issue is not really applicable in this case.

During installation I didn't enter a product key and on my previous installation I had a similar issue where even after entering a product key, the UAC box kept on popping up every time I opened Office so I suspected a similar problem.

The workaround is easy but annoying. Disable User Account Control (UAC), logout, open Outlook, this time it should prompt for the product key. After entering it with UAC disabled Outlook (and other Office applications for that matter) should open without a problem. Enable UAC again and things should be back to normal.

[OT: Freshly installed Vista RC2 is bliss after my previous experiences on this machine :)]