The safest way to create an image is to use a VM (virtual machine) and save "snapshots" of the machine, especially when working with Windows. Creating a snapshot of your OS before you run "sysprep.exe /generalize" will save you the headache of having to rebuild your image from scratch if you reinitialize the rearm over 3 times. (see: To resolve this issue, you must rebuild the Windows image.)
So, why VMware? The benefit of VMware is that I can build both my 32-bit and 64-bit images natively on a 64-bit host machine. This is important because I deploy my images through Windows Deployment Services (WDS) and it will recognize the 64-bit architecture of my host machine.
monitor_control.disable_longmode = TRUE
Good luck, and happy computing!