I've created a bundle to remove a program (MS Security Essentials, in case it matters) from some workstations using the uninstall strings in the registry (worked on a test machine when run on the command line as administrator). I've set the bundle to run as a dynamic administrator, but it's failing with an error of:

Error launching "C:\Program Files\Microsoft Security Client\Setup.exe /x /s". Windows error: The operation was canceled by the user

How can a dynamic administrator that isn't running interactively cancel a bundle? Anyone else seen this?