If the drive is not found or it doesn’t contain the \Windows folder, type dir b: and press Enter. If it is there, that is the System Drive. If drive A: is found and a directory is displayed, check for the \Windows folder in the directory. If no asterisk is found, then the disk is set as MBR.įrom the Command Prompt, type dir a: and press Enter. Look for your disk and see if the GPT column has an asterisk (*) – this will indicate the disk is GPT. In the Command Prompt, type diskpartand press Enter. Once you have reached the Windows Setup screen (where you select the Language, Time and Keyboard settings), press the SHIFT + F10 keys to bring up the Command Prompt.įind out whether your disk is set to GUID Partition Table (GPT) or Master Boot Record (MBR): If you don’t have a bootable media available, you can obtain one by following the create installation media steps found here.īoot from any DVD or USB Windows 7, 8, or 10 media. Try disconnecting any drives that don’t contain an operating system.Ī bootable USB or DVD with Windows 7 or higher is needed to bring up the Command Prompt.

When trying to boot Windows, you receive the error:Īn operating system wasn’t found.