|Nero has settings where you can simulate burning but not actually do the burn. You may have run a simulation without actually burning. If so, the disk still has nothing on it. Check your settings in Nero; consult the Help in Nero. |
"If it is a Microsoft Disk you can not copy directly you have to burn them from ISOs."
A copy of a Microsoft disk will work (boot) fine if you use "Disk at Once" or similar, which also copies the normally hidden from view Microsoft Corporation.img file, or similar.
CD-R and DVD-R disks are the most likely to be recognized properly by any computer's optical drive (for DVD-Rs the drive must be able to read DVDs) ; if the disk is a different type it may not read properly in a drive it was not made in.