How to reinstall with Dual Boot Win 7

Soldato
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6 Jan 2013
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TLDR: How do we clean install Win10 after a successful upgrade goes wrong?

  • I upgraded Win8.1 to Win10 on a SSD.
  • I installed another SSD and installed Win7.
  • I altered the boot to allow dual boot, and I get the choice of OS at boot.
  • Win7 works fine.
  • Win10 tries to boot, but hangs just before loading Desktop.

I think I should've installed 7 before 10. :(

Now I want to disable dual boot, clean install 10 and re-enable dual boot.

Because my Win8.1 was upgraded to 10, can I do a clean install of 10 using USB and type in the key for 8.1?
 
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