Windows 10: Windows 10 bootloader on wrong disk, even though GRUB is the bootldr

First post, so be gentle please. I'm having a strange issue, so let me explain the backstory first.

I don't have a Windows 10 license, so I do that thing where you use Windows 7's activation to get one. Doing so requires Windows 7 to be installed, and I kept it in case Windows 10 screwed up, which surprisingly it didn't. Anyway, I now want to remove the partition that Windows 7 is on for more Linux, because I always need more Linux. Well, it seems that the bootloader is for some fricking reason, on the Windows 7 drive, and now it wont boot because the computer doesn't see it as a bootable drive. Keep in mind, GRUB is still working fine. I tried "bcdboot C:..." (I forget the rest) and that just made it not boot at all. I tried recovering from the install USB I had in the first place, but that doesn't seem to see the install at all. I don't really _require_ Windows 10, but I also don't want to reinstall, as I've got a *lot* of customizations in it, and that's a pain as then I'd have to reinstall Linux as well. What can I do here?

Thanks,
Ashleigh

:)

 

Make Windows 10 Bootloader Override Windows 7 Bootloader/GRUB


Now after running into two different grub errors, my PC refuses to boot from anything. First I got the grub error no such partition, so I booted from Ubuntu 17.10 install disk and reinstalled Ubuntu 17.10, removing the previous installation of Ubuntu 17.10. After resinstalling, I booted once, and grub appeared normally, I think I also booted into Windows 10 from grub and ever after that, I can no longer boot period. I get this:

GNU GRUB version 0.97 (593K lower / 523264K upper memory)
[ Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename. ]

I've tried booting from Windows 7 & 10, Ubuntu 17.10, 18.04 & DBAN (hdd wipe) disks with no success. Now what? (trying the grub commands from this link:

How to recover lost GRUB bootloader in Linux

didn't work).

 

Make Windows 10 Bootloader Override Windows 7 Bootloader/GRUB

 

Grub bootloader before windows8

will the W10 upgrade work if you have a linux bootloader setup before the windows
bootloader ?

had some negative experience before, (8 pro >> 8.1 pro update) that messed up the upgrade then, got stuck at 80% and then told me nice that it "fails-to-install"
and rolled back to 8.

so are there any 10 testers (who have the same setup as me and) who can tell me if MS has a better upgrade method this time, last time i spend hours, had 2 fix the grub, because the w8.1
had deleted it and it kept upgrading a failing system in its own circles, like a crazy dog trailing its own tail.

so will this upgrade experience in my situation be better this time?

or do i
need to remove grub again ?