How to change hard disk partition from GPT to normal


Hello list
I try to install windows 10 on a hard disk but I get an error that the
partition is wrong. I discovered that the partition is GPT (whatever that
might be). I connected the drive to my pc but in partition manager it can
not delete the drive. I also tried Casper but with the same result, so I do
not know how to repartition it. Can someone please help?

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