GRUB is perfectly fine , except Windows boot loader will always be recommended . GRUB can be prone to errors with a few anti-virus applications that insist on including little or otherwise harmless files into the Master Boot Record . These types of files ultimately alter and harm the GRUB loader .
Another note of precaution before we go through the process of restoring the Windows boot loader in MBR . At times , the Linux boot loader is more optimal for this situation , but not installed in the Master Boot Record , but instead in the Linux installation boot partition . In the event that the /boot is not a separate partition , the Linux boot loader can be installed in the main partition . This process allows the Windows boot manager the main responsibility of booting applications during a restart . Additionally , reinstalling Windows will not cause a loss of access to the Linux side of the dual boot .
Now that we understand the benefits of restoring the Windows boot loader , let's get this started ! The first step is to download the essential tool that will make this nice and easy : EasyBCD . Go to their main website and click on the "Download free for limited , non-commercial use" link . Following the basic installation instructions and load it up .
The first step is to go to the BCD Deployment tab on the left of the main menu . At the bottom of that tab is a button that says "Write MBR" with a STOP SIGN next to it . Click on that button . Do note : If your intent was to sever ties with the Linux installation , this will have done the trick . You can no longer boot the