run the setup.exe from the run cmd with the /a switch i.e E:\office\setup.exe /a this will install in administrative mode. type in your serial and complete install. ensure you install in a folder other than program files i.e desktop\office. once installed you can install silently by running the PRO11.MSI file with the /qb switch, ie PRO11.MSI /qb BINGO this should do it!!