Dual boot 2 version of Windows
-I have windows 10 installed on a computer and want to make it in dual boot with windows 7 is it possible without removing 10 and then installing 7 and then reinstalling windows 10?
look at this two possibilities
1- Windows 7 installed. Install windows 10 dual boot (no problem it works)
but what i want is the following :
Windows 10 is installed
Install windows 7 in dual boot
Here is a good Microsoft Article for doing that.
This is a fairly long and technical article. As I noted at the end, Virtual Machines are better, but if you wish to try this, make sure you read the entire article.
Dual Boot Win 7 after Windows 10
Your PC may refuse to boot and or unexpected PC crashes could damage or even delete your files, so you should create an Image backup your Windows 10 installation before you proceed to install Windows 7.
If you purchased a new computer with Windows 10 preinstalled then check your manufacture’s support web site to see if there are Windows 7 (or 8.1) device drivers available. The lack of device drivers is a good indication that your new computer is not Windows 7 compatible.
If you upgraded from Windows 7 or 8.1 to Windows 10 then you cannot use your existing product key to re-install Windows 7 or 8.1 as it was the basis for your free upgrade to Windows 10. Therefore you must either have another unused product key and installation media or purchase another copy (OEM or Retail) version of Windows 7 or 8.1, note that anyone who offers to sell you just a product key without any installation media may be a scammer.
Create an Image Backup of your existing Windows 10 installation before you start the process of installing Windows 7 or 8.1
You will need to “Shrink” the existing Windows 10 partition to create space (another partition) for Windows 7 or 8.1.
Once Windows 7 is installed you will need to re-install your applications that are not compatible with Windows 10 so locate the application(s) installation media and associated product key(s) that need to be re-installed.
However, better, I think to avoid problems when reinstalling Windows 10 to do a Repair and subsequent boot issues, would be to make Windows 7 a Virtual Machine.
Virtual Machines will also allow you to more easily upgrade Windows 10 to Windows 11 when / if that time comes for you.
I use Virtual Machines and they work exceedingly well. Much recommended.