Modifying the MBR of Windows

Question

I need to modify the MBR of Windows, and I would really like to do this from Windows.

Here are my questions. I know that I can get a handle on a physical device with

Answer 1

Maybe a PXE boot scenario could help you? Simply boot on your crafted PXE image which modify the hardware registers you need to modify, and then return the control to the Master Boot Record or to the active partition's boot record.

This way you don't have to modify the boot records.