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I got a huge virus in Windows, then it collapsed and I accidentally changed the BIOS from UEFI to LEGACY (I couldn't start BIOS in any way).

Then I installed Ubuntu because that was the only way I found to recover my files, but I want to install Windows again along with Ubuntu, the BIOS is lost (I start the USB boot with GRUB2) but when I try to install Windows again in the new partition I created for Windows it says the it couldn't find a new partition (even though I created a new one to add Windows as well).

I'm going mad about this, can you please help me?

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    Update I was able to rewrite Windows in Ubuntu partition, still no BIOS, now im stuck in a shitty OS :'( #imissubuntu – Antonio Benard Dec 3 '17 at 6:13
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First Things First

The BIOS cannot be deleted, otherwise GRUB2 would not load.

Second, My Suggestion is to use GParted on a Live USB version of Ubuntu, and delete EVERY partition possible. After that you will need a Recovery Media for Windows, and a Product Key. If you do not have Recovery Media, you can download it from the Microsoft Website, and you will need to have an extra computer and a USB. If you do not have a Product Key, you will need to find it on the bottom of your laptop or on the back of your monitor / computer case.

In the case that there is an error code, you will need to use google to find the solution.

  • NOTE : You can ALWAYS Reinstall Ubuntu – AutoBootDisk Dec 3 '17 at 6:34
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Use your Ubuntu live installation to back up any files from the windows partitions.(You may need to use the command

ntfsfix /dev/*

where * is the partition that failed to be mounted Then try a clean install of windows(This includes formatting the whole hard drive and re partitioning

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