Aporte original por: oldturkey03 ,
It seems like your OS disk is probably an upgrade that requires you to already have a version of that OS on the computer. I do not think that you can reinstall the OS unless you have a complete OS disk not an upgrade. You can try and purchase one of ebay or even microsoft. What OS are you trying to install? May be you could consider to get into many of the linux versions that are pretty decent and relative easy to install.