Hey hi just saw your post after searching numerous posts on the web. I just want to know if used the command c:\windows\system32> Slmgr /ipk XXXXX XXXXX XXXXX XXXXX XXXXX by applying a genuine product key, will this activate the windows or it will just validate and install the product key and i have to use /ato option for activating it later. See my purpose is to only validate a supplied product key as i am developing application for OEMs who want to activate the windows later. I just want to validate whether product key is valid, So if i use /ipk option with Slmgr:- 1.) Will this validate(and if OK) then install and activate the windows. 2.) Or it will do a validate(and if OK) just install the product key. I'm desperately lloking for help on second option, as i just want to validate and install the key, but dont want to activate windows.