when this error pops up. you need to go back to the windows installation screen and click on the repair your computer option. Then select Troubleshoot option and find the command prompt. After that click on the command prompt windows will popup, now in command prompt enter "diskpart" then write "list disk" it will show all the disks available on your pc Now select the desired disk where you want to install the windows. or select the disk which was giving the error in the installation panel. once it is done, then write "clean" and press Enter write all the commands without "inverted commas" Once it's clear then you can again perform the installation steps from your pen drive.