First thing is a decision needs to be made. Do you want to try and save anything on the disk? If the answer is No, then it is simple; boot the install media, delete all partitions, create new partition, then follow the prompts to complete the install. If you wanted to just install where windows is currently installed (probably Drive 0 Partition 2) then boot the install media, format only Drive 0 Partition 2, choose this partition for windows install, then follow the prompts to complete the install.
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