Tip: If the steps below do not work you may want to check your PC for a MBR virus infection
Steps to fix MBR
1. Step Start your computer and Insert Windows 8 DVD. Make sure you have already your boot order to boot from DVD. Then click on the Repair your computer.
2. Step Next, Click on the Troubleshoot.
3. Step Next, click on the Advanced options.
4. Step Next, click on the Command prompt.
5. Step Next, in the Command prompt, type ‘bootrec.exe /fixmbr’ and press Enter.
6. Step Finally, you will see the message ‘The operation completed successfully’.
Conclusion
Usually the MBR gets damaged or corrupted after a cold-start of your PC. Follow the steps provided in this tutorial to fix the MBR in Windows 8.