I am another expert, my name is***** and I will also try to help you. Let´s directly address your question that you wanted to get answered. You asked:
"to me it is a simple question and that is that I can use f3 to re organise my laptop ,so if I wish I can re do my laptop when I wish to Elwyn"
The answer is: no, you can´t, it´s not as easy as that, the experts that have been with your before me are right about this. However, it *could* be the case that you had assigned the F3 key to a special function within Windows, possibly a software that came with your Samsung. But since you can´t do that anymore now, the software might have been de-installed.
Can you please try to remember at which stage you´ve pressed the F3 key before when it had the function of resetting your Windows? Was it within Windows or was it at the BIOS stage (the screen that comes up directly after you´ve turned on your laptop)? If it was within Windows: did the software ask you if you want to reset your Windows to default or something along those lines?
I really want to help you with this, but we need to collect all the informations first to make that work and I fully understand that you might have problems with that because of your illness. So take your time please. If that F3-key-function was something that you´ve used within Windows, I would recommend that we do a remote-assistance. I can then directly connect to your computer and get the problem solved within Windows. But let´s first let me know about my other questions above.
Thank you very much and all the best recovery wishes for you illness,