C++ boot from bios (VERY simple OS)

so i want the program or OS to boot from when the pc boots. Is this possible? Ive heard that windows is partially built in c++ so i assume so. I guess that i am going to need to learn a lot more and do a lot more reading but im preparred to.

All i want it to do is boot up put into a predefined password and once it is entered proceed to play through a series of images.

any information is greatly appreciated.
I though all this kind of low level hardware communication was implemented in assembly.
I have to agree with Perter78 this part is normally done in assembly. the Kernel of your OS could be built in c++ in fact I suggest it. if you have no previous knowledge take a look at:

i have not heard of it so i will have a look. Thanks
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