When I try to boot it, it just says 'BOOTMGR IS MISSING. PRESS CTRL+ALT+DEL TO RESTART'.
I have tried everything, using flash drives, checking BIOS making sure that it's on CDROM. I can't seem to find the right thread related to this. Any solutions?
First, was this disk working before? Can you test it in another system? If you created this disk yourself from an ISO file, did you actually create the disk from the ISO like an image or did you just copy the file to the disk?