EDIT: the url below no longer works. The user must have removed the video from vimeo. Unfortunately I can't remember who 'BC' is (shoulda been bleeping computer). If I find a worthy video to update this post, I will edit again.
This post is on a live tutorial video with privacy tips. Great video by BC on essential installation steps for Windows 7, . Turn up the sound. Here, emphasis is security and privacy on bare-metal install before you even install network drivers. So before connecting with MSFT. Notice carefully how he turns off all the phoning home features, esp. Windows Updates etc. This is vital for protecting your computer from some later slipped-in MSFT telemetry.
You can always seek updates to Window 7 manually, but if you follow the video steps, MSFT will not be contacting your machine (you'd have to re-enable services and GPO settings, or bypass them on an ad hoc basis, at your own end). So you regain control of your own machine.
So you can also see step by step, how to create a Virtual Box and in it, to install Win7.
Now, whatever other OS you want to install, will be very similar.