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Method 1: Repair MBR disk with Windows installation disk
- Press the “Power” button to turn on PC > Hit “Enter” when Boot from CD prompt.
- Press “R” key in Windows Setup Menu to start the Recovery Console.
- Type: FIXMBR at the C:\> prompt and hit “Enter”
- Press “Y” key > hit “Enter” when asked if you want to write a new MBR;
How do I fix missing operating system?
Follow the steps below carefully to repair the MBR.
- Insert the Windows Operating System Disc into the optical (CD or DVD) drive.
- Press and hold the Power button for 5 Seconds to turn off the PC.
- Press the Enter key when prompted to Boot from CD.
- From the Windows Setup Menu, press the R key to start the Recovery Console.
What causes missing operating system error?
It may be caused by an error in BIOS configuration, a faulty hard drive, or a damaged Master Boot Record. Another possible error message is “Missing operating system“. This error is also very common on Sony Vaio Laptops.
