I want to know how to replace my windows 7 boot manager with Windows 10 boot manager. I have a windows 8 disc.

I had a dual boot setup with Windows 7 and 10, installed on separate partitions on the same disk. I never used Windows 10 so I must have done something a while back to prevent the 'select an operating system' during boot.

Anyway, the time has come where I'd like to use Windows 10 again. However, the windows 10 operating system did not appear in msconfig.

I downloaded visual BCD and gave it a try. I was able to add a boot loader for the win10 partition.

Now during boot, I have the option to choose an operating system (and win10 appears in msconfig). However, when I choose win10 I receive an error about the winload.exe (or was it bootload.exe) having an invalid certificate or something.

Now I've read that this can be caused by the win7 boot manager not recognizing the win10 loader. So somehow, my boot manager has reverted to the windows 7 version.

Does anyone have any advice on fixing this? I've been looking for an answer but nothing was clear..

  • Reinstall Windows 10? It's not like you're loosing something in the process considering you actually never used it... – user772515 Mar 22 '18 at 2:16
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    You probably don't even need a full re-install of Win10 (though that might be fastest if you can get modern install media, as otherwise you'll need to download years of patches). Windows has a boot repair feature that will fix/update the bootloader. The Win10 bootloader is capable of loading Win7 - they both use BCD and the modern Windows loader, rather than the legacy one (that used boot.ini) used in XP and below - so you should be fine using the Win10 loader to choose which OS you want to start. – CBHacking Mar 22 '18 at 2:24
  • @CBHacking I think your comment could be the start of a very good and educational answer. – user772515 Mar 22 '18 at 22:30
  • Thanks for the ideas. As far as reinstalling windows- please note that I have a win8 disc and did the free upgrade to win10. So, if I can reinstall and maintain windows 10 that's fine, but not sure how that would work with a win8 disc? Downloading updates and patches is a pain, but is doable as I have plenty of data. I'm not sure if I've tried the repair feature on the disc since adding the boot loader for the win10 partition. Didn't work before but it may now so I'll try again. – mike shore Mar 23 '18 at 7:37

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