Really bad problem with pc (PLEASE HELP)

  Raze482737 15:25 15 Apr 2018

My pc had really had really bad problems lag,viruses,update fails and many more so I decided to reinstall windows. I formatted the disk then when I noticed that message windows cannot be installed on this disk.when I press details, it reads the selected disk has an MBR partition table on efi systems windows can only be installed to gpt disks. When I click on repair your computer it said that it's not available on this version of Windows PLEASE HELP ME!

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