First things first. I would like to give credit to one of our technical consultants, Henry Pollock, for getting to the bottom of this one.
During a recent upgrade, we received the following error when attempting to apply Service Pack 3 on a Dynamics GP 9.0 install on a new Windows Server 2008 box.
Note that the original install of GP 9.0 had gone fine. A little digging and it turns out you need to disable UAC (User Access Control) on Windows Server 2008 prior to running the service pack install.
If I were a betting man, I’d guess we’d come across a similar issue on Vista workstations.