I just tried your switch and it didnt work fom me either, if you want to test nlaom succesfully I made a Diskeeper 10 addon, but it took trial and error, for example the switch starts with /S in caps instead of the diskeeper 7 (" /s /v""/qn REBOOT=Suppress") one from nlaom,here is the diskeeper 10 switch: /S /v/qb took me bout a thousand tries to find it, and yes! nlaom is suposed to make a silent switch installer. Which the program that you are making?