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You might want to switch from VBox to VM Player which seems to have a higher success rate for seeing 10 VMs run on 7. The 7.1.2 version just seen out on June 15th is the freeware version while the latest Workstation Player 12 is a trial version only when arriving at the download page itself and using the two dropdown options menu for "Major" and "Minor" seen at https://my.vmware.com/web/vmware/fre...duct_downloads
The guide for settting up a VM on that player can be looked over for getting familiar with things. VMware Player - Install Windows 10 - Windows 10 Forums[2]=Virtualization
The screen there shows the product key being skipped past during a 10 install on VM Player.
Just.... any 32-bit version?
(I have tried to open that file because there is a bundle from my magazine cd, but for 64-bit only, and FYI, the windows 10 files are from that cd too xD)
If you got some cd with 10 files on it I wouldn't even advise using it! 10 is presently available for download by way of the MS Media Creation Tool! Windows 10 ISO Download - Windows 10 Forums[2]=Installation%20and%20Setup
Now for the 32bit flavor of VM Player if that is what you are looking for at the download page there are two dropdown options lists for the selection of which version of VM Player to go with. The 32bit is selected by opting for 6.0 in the "Major" as well as 6.0.7(latest) in the "Minor" seen on the page itself. https://my.vmware.com/web/vmware/fre...duct_downloads
The best option when using the MC Tool is to keep skipping the Upgrade Now, create usb media, and onto selecting the folder to save the iso download to before arriving at the last options screen of choosing between burning a dvd or saving the download to a folder. The default download name will be "Windows.iso" which you can easily change on the spot to "Windows 10 Home x86.iso" or 32bit if not going with the Pro edition depending on what your upgrade path would be. For 7 Home Basic, Home Premium, I doubt the 7 Starter edition however, 8 or 8.1 Home that would 10 Home. For 7 Pro and Ultimate as well as 8, 8.1 Pro you would go for 10 Pro.
Now if everything there is 32bit then you would get the 32bit 6.0.1 version of the VM Player as well as download and save the 32bit flavor of the edition you plan to run on the VM. Later on if you decided to upgrade either 7 or 8 to 10 and the upgrade is activated you can then change from the 32bit to 64bit 10 when going to perform a fresh clean install of 10. I did that for 7 HP x86 laptop to see the 64bit 10 Home clean install following the initial upgrade and then onto clean install of the 32bit at first. That was to verify all had gone well as far as the activation process.