Oh, I am not Microsoft and neither is 99% of the people who reply here on the forum.
That is not a good idea anyhow because of the lack of motherboard resource drivers. Those drivers are included with the recovery system.
If you perform a RESET, you would be reverted back to 8.0 and have to redo everything in a stair-step fashion to get back to Windows 8.1 Update 1. You may want to do that pretty soon. There is word that Update 2 maybe coming out later this year.
Also, in the future, I would recommend to keep all documents, pictures, music, and videos on a micro-SD card. I have a RT and I do that. I only have 5 document files on the tablet itself and it is a 32GB model with 48% free space on it.
I would also restrict the number of Metro UI apps for installation on the tablet as well. Those are stored in a hidden folder in your user account. That is one of the reasons why your user account folder is taking up 10GB of space.
When you rent movies to watch later when off-line, the movie itself is stored in the Videos folder and in a sub-folder "Movies". Those stay there until you manually delete them. If they are HD in format, that is 3.6GB and larger in file size for each movie.
If you buy movies from the tablet, I would recommend to use a desktop or laptop to download the movie and on the tablet itself, just stream it to watch it. When you buy a movie, it is permanently assigned to your account like your apps and any Windows 8 machine
you log onto with your account, your movies follow you and you re-download them.
I do believe you can do the same thing with music as well unless you are using Windows Media Player for that.
Do remember that you have a TABLET. It is not a laptop even though everybody and their pet dog are using it as a laptop, it is still a tablet. You do not install every file and program you own onto it at the same time. Keep it limited and you should have
no problem.