PC Wont Boot into Windows

[crushthegush]

As I described in the title, the PC won't boot into windows. I am currently trying to fix my friends PC, so I don't know much of any specifics before this occurred but to my knowledge he reverted windows 11 to windows 10, then eventually it wouldn't boot into Windows.

I created a flash drive to boot off of with multiple ISO files using Ventoy. It will boot into Linux Mint or even Linux Ubuntu, however any Windows ISO (Windows 10, Hirons) will not work at all. Maybe I'm looking up the wrong questions, but when I try to search this I don't get much relevant information on how to fix this or what the issue could be.

Trying to boot from any of the drives will not come up with anything either, it will simply ask to restart and change the boot order in BIOS (forgot the exact screen). Both drives are recognized in Linux with all of it's information, however I'm really, really stupid when it comes to Linux so I have no clue what I'm doing. To my knowledge however, I can't even access the files that are in these drives, however they're recognized.

Any sort of advice or help would be greatly appreciated!