You need to convert MBR to GPT to be able to install Windows. Use diskpart to convert the disk to GPT. The following method will erase all the data on the hard disk, therefore, your data will not be recoverable.
Turn off your PC and boot it from the USB that contains the Windows installation. Next, in Windows Setup, press the Shift + F10 keys at the same time.
In Command Prompt, Enter the following commands and press "Enter" after entering each command:
select disk x (replace the letter x by the number referring to "Partition 1").
Close Command Prompt and continue the Windows installation. When asked "Which type of installation do you want?", choose Custom. Select the disk you've formatted and click Next to install Windows on that disk.