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Trouble fixing Windows 10 boot problem

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Feb 13, 2016
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Location
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System Name Ryzen Monster
Processor Ryzen 7 5700X3D
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Mouse Corsair Ironclaw wireless
Keyboard Logitech G213
VR HMD Headphones Logitech G533 wireless
Software Windows 11 Start 11
Benchmark Scores 3DMark Time Spy 4532 (9258 March 2021, 9399 July 2021)
A customer has given me his laptop to fix after he got invaded by malware having clicked on a dodgy link.
It's looping in the Windows repair screen and this is what I've tried so far, before invoking the nuclear option:
No restore point found - (as usual) and no disk image made anyway.
I've tried fixing the MBR by using:
bootrec /fixboot
bootrec /fixmbr
bootrec /rebuildbcd


At first, I was getting an access denied on fixboot command, so I entered bootsect /nt60 sys which fixed that message and fixboot worked successfully.
None of this has got the machine booting and I've also used EaseUS bootable to rebuild the MBR.
The only thing I haven't tried is the following because it's a legacy BIOS and I'm confused about whether the same route would work on non-EUFI systems since there isn't an EFI partition, or would the same principle apply?

Type in the command:
Diskpart
Type in the command:
List disk (Note which disk is your Boot drive)
Type in the command:
Sel disk 0
Type in the command:
List vol (Note which volume is the EFI partition)
Type in the command:
Sel vol 4
Type in the command:
assign letter=V:
Type in the command:
Exit
Type in the command:
V:
After you have assigned a drive letter Using Diskpart You can format the EFI partition:
Example: if you assigned a letter V to the partition the command would be:
format V: /FS:FAT32
After the format you need to recreate the EFI directory structure with the command:
MD \EFI\Microsoft\Boot
Then change to the Boot directory with:
cd /d V:\EFI\Microsoft\Boot\
Then run:
bootrec /FixBoot
Finally run:
bcdboot c:\Windows /l en-us /s V: /f All
type in the command:
bcdboot C:\windows /s V: /f UEFI

I'm booting from new Windows 10 media on USB.
 
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