Window update for windows 110

I have just updated my new Hp desktop which came with windows 10 with the latest window 10 update . Unfortunately my desktop screen now just flashes as if it is on a loop and I can’t do anything except ctrl ,alt delete to get into the configuration mode. I have spoken to microsoft help and they arranged for me to download a windows 10 iso file( 4gb) to my old computer. I then copied this file to a dvd which I inserted to my faulty  computer but i can’t get the computer to read this disk . I tried in safe mode which would let me into the disk and start the set up  but it would not let me actually load any files.  Any help would be appreciated