Thanks for that but I have not got a second computer.one fix could be to do this:
On another PC, download the Windows 10 media creation tool and use it to make a win 10 installer on USB
once you have usb, put it in the PC with error
open file explorer (win + e key)
navigate to the USB and run setup
this should offer to update windows install (as 21H1 isn't newest version)
that should fix the problem.
Why would he need a second computer?one fix could be to do this:
On another PC, download the Windows 10 media creation tool and use it to make a win 10 installer on USB
once you have usb, put it in the PC with error
open file explorer (win + e key)
navigate to the USB and run setup
this should offer to update windows install (as 21H1 isn't newest version)
that should fix the problem.