If you are still searching for the solution, here is the solution. You don't need any third party application to change the text. Just mount Boot.wim and search for the Winload.exe.mui (not Winload.exe)and search for the text "starting Windows" I don't remember the exact location of the text I would update my post and will let you know the exact location of the text, as currently I am at office and here I have XP. I have successfully changed that text and that too without using any third party application, like bootupdater. But this would be visible only once when you start your windows installation, if you wish to change the text which can be visible for all time your boot your system, you have to use Bootupdater. Enjoy....................