Thanks to the Bootrec Fixboot, Windows will start this Windows RE automatically once your computer fails to boot. It is a popular tool that Microsoft provides for users. General information about Bootrec FixBoot How to define Bootrec Fixboot? Conclusion “Bootrec/fixboot access is denied”.Helpful steps to save you from the issue “bootrec /fixboot access denied”.What happens when the MBR gets corrupted?.General information about Bootrec FixBoot.