Hi and welcome ( again :) )
If I understand correctly you wish to scan your system before booting from Windows.
In your description you mention MBAM.
I would need one of the security experts here to confirm this - but I don't think MBAM is designed to run outside of Windows.
I can, however, offer you another option - MS Windows Defender Offline.
click here
It can be installed onto a CD or Flash Drive ( Memory Stick )
You simply install the CD or F-Drive prior to switching on.
This should do the same job as MBAM would - if it could be run in this situation.
One of our security experts may be able to offer other options.