Difficulty while trying to setup a new Windows on a dual boo

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Vynylyne

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Mar 22, 2017
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I have a dual boot notebook (using GRUB): Windows 10.0 & Linux ubuntu 14.04 which has been installed after that. I want to purge Windows 10.0 and perform a completely clean Windows 7.0 installation including some minor changes to Windows partitions. Actually, I took the free offer from Microsoft to auto-upgrade from 7.0 to 10.0 but after doing so, my notebook performs too slow and very poor. So I want to get back to 7.0. The problem is that Windows 7 setup programme says that if I want to do anything related to the partitions, I've got to boot from Windows DVD and from there I'b be able to perform installation from zero but:

  1. Whenever I want to boot from DVD, a message appears saying that boot from CD/DVD is blocked (or forbidden) somehow.
  2. Also, I am kind of worried about booting from DVD and trying to purge that Windows: Damaging GRUB or corrupting Linux or something like that.
Is there any way safe to do so without damaging or losing or having to reinstall Linux?
 
Joined
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Reinstalling Windows on a PC that has a grub boot will definitely get grub clobbered. But I think you can repair grub afterwards. Ask in the Linux forum.
 
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