Hi Gyro,
You are right: I am not familiar at all with VirtualBox.

I search online how to use it, and was able to install Win10. It was running, but I was unable to share a folder with my Linux part
Indeed, I didn't install the Guest Additions.
So I did, following your instructions.
After that, Win10 did not want to boot again: It freezes on the splash screen
Since I finally found a Win7 and even WinXP ISO file, I repeat the installation.
in both cases, Windows is up and running, but when I install the Guest Additions, it reboots no more. Same symptoms: It freezes on the splash screen.
It's really weird that it fails everytime in the same way.....
There must be something obvious that I'm missing.....

Any clue ?
Thanks !
EDIT: For the Guest Additions, my architecture is 64 bits, so I choose AMD64. Since it didn't work, I also try the x86 version, without further luck, of course....