Yes that's because your boot partition is MBR. If it was formatted as GPT it wouldn't boot from legacy BIOS.. Same as OP's issue The controller isn't the problem anyway the BIOS is. Legacy bios can't hand off control to an OS installed on GPT partition because the OS is in UEFI mode, that's what happens with GPT, OS gets installed in UEFI. Then can't boot.

Zitat von Fernando im Beitrag #8

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A look into the files named setuperr.log and - more specificly - setupact.log, which are stored within the Windows\Panther folder, may give you a hint to what happened. For details please look >here<.
If you cannot boot into the OS (not even in safe mode), I recommend to boot off a media containing a WinPE version.

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Zitat von zach.laberge im Beitrag #17

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I was not able to access Safe Mode whatsoever. In fact, after a few restarts, an error message of 0xc0000001 came up. More on that later...
I was able to access the error log files you mentioned before by booting into the Repair utility on the installation media. However, the content of the logs there wasn't related to anything about the previous boot errors.
Sadly, I didn't have time to try WinPE today. You'll either hear from me tomorrow or next week on my progress with that.

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@Fernando @Pill Monster

Apologies for not answering before. This morning, after a low-level hard drive format, I was finally able to finish the Windows install. Not sure what configuration it was that was causing this problem in the first place, but happy to see it resolved.

Thanks again for your help, everyone. Have a good one. :)