Unable to perform a Windows 10 Clean Install

Because my PC has many issues I want to do a clean install. However, I am having the following issue. When I go to start the install to my PC C drive, I get this error message. "Windows cannot be installed to this disk. The selected disk has an MBR partition table, Windows can only be installed to GPT disks onEFI systems." BIOS Mode Legacy. Is there a Registry change that I can do to convince the Windows 10 installation that my PC has a Legacy BIOS and is not UEFI or EFI?

Thank You

1. What did you use to create the Windows 10 installation USB flash drive with?
2. When you are in the boot override menu to boot from the USB flash drive, with CSM enabled there may be two entries for the USB flash drive. One will boot in UEFI mode, the other will boot in CSM (Legacy BIOS) mode.
3. If you have nothing on the hard drive that you want to save, just delete all the partitions on the hard drive and select the unallocated space to install to.

Your computer is currently booting in CSM mode (Legacy BIOS emulation). That does not mean the computer is not UEFI. Your computer clearly is UEFI. The default boot mode for a UEFI is - surprisingly, UEFI. So when you are booting from the USB flash it is defaulting to UEFI mode. Whatever mode you boot the USB flash drive in, that is the mode that Windows 10 will install in.

Thank You NavyLCDR for your quick reply. 1. What did you use to create the Windows 10 installation USB flash drive with? - I did not create a Windows 10 installation USB flash drive, I burned a Windows 10 installation disc, by using Windows 10 MediaCreationTool and using MagicArchiver Version 1.0. Should I have created a Windows 10 installation USB flash drive vs a Windows 10 installation disc? Is it a must that I use a Windows 10 installation USB flash drive? I may try deleting all the partitions on the hard drive and select the unallocated space to install to using my Windows 10 installation disc Thanks Again

I have tried three times, as Administrator in cmd, to run the code of "gwmi -class Lenovo_BiosSetting -namespace root\wmi | ForEach-Object {if ($_.CurrentSetting -ne "") {Write-Host $_.CurrentSetting.replace(","," = ")}}" and the results I get are in each case are "gwmi" is not recognized as an internal or external command, operable program or batch file. Thanks zbook

Deleting all partitions and making an unallocated drive should allow the clean install to work.

Each computer manufacturer has their own commands to use Windows to display the BIOS settings.

Were the commands tried using administrative powershell?

This was the Lenovo link with the information:
https://download.lenovo.com/pccbbs/m..._deploy_01.pdf

What were the results of the bcdedit and other commands?

bcdedit Microsoft Windows [Version 10.0.16299.699]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\windows\system32>gwmi -class Lenovo_BiosSetting -namespace root\wmi | ForEach-Object {if ($_.CurrentSetting -ne "") {Write-Host $_.CurrentSetting.replace(","," = ")}}
'gwmi' is not recognized as an internal or external command,
operable program or batch file.

C:\windows\system32>gwmi -class Lenovo_BiosSetting -namespace root\wmi | ForEach-Object {if ($_.CurrentSetting -ne "") {Write-Host $_.CurrentSetting.replace(","," = ")}}
'gwmi' is not recognized as an internal or external command,
operable program or batch file.

C:\windows\system32>gwmi -class Lenovo_BiosSetting -namespace root\wmi | ForEach-Object {if ($_.CurrentSetting -ne "") {Write-Host $_.CurrentSetting.replace(","," = ")}}
'gwmi' is not recognized as an internal or external command,
operable program or batch file.

C:\windows\system32>gwmi -class Lenovo_BiosSetting -namespace root\wmi | ForEach-Object {if ($_.CurrentSetting -ne "") {Write-Host $_.CurrentSetting.replace(","," = ")}}
'gwmi' is not recognized as an internal or external command,
operable program or batch file.

C:\windows\system32>bcdedit

Windows Boot Manager
--------------------
identifier {bootmgr}
device boot
description Windows Boot Manager
locale en-us
inherit {globalsettings}
default {current}
resumeobject {7a82d5b2-7634-11e1-8e2d-bce9bfac6809}
displayorder {current}
toolsdisplayorder {memdiag}
timeout 30
noerrordisplay No

Windows Boot Loader
-------------------
identifier {current}
device locate=\windows\{F5D0FE7F-F50B-4644-99D5-AE593D1967B4}
path \windows\system32\winload.exe
description Microsoft Windows
locale en-us
loadoptions DDISABLE_INTEGRITY_CHECKS
inherit {bootloadersettings}
nointegritychecks Yes
allowedinmemorysettings 0x15000075
osdevice locate=\windows\{F5D0FE7F-F50B-4644-99D5-AE593D1967B4}
systemroot \windows
custom:22000005 \windows\{F5D0FE7F-F50B-4644-99D5-AE593D1967B4}
resumeobject {7a82d5b2-7634-11e1-8e2d-bce9bfac6809}
nx OptIn
pae Default
driverloadfailurepolicy UseErrorControl
bootmenupolicy Standard
detecthal Yes
nocrashautoreboot Yes
uselegacyapicmode Yes

C:\windows\system32>

Microsoft Windows [Version 10.0.16299.699](c) 2017 Microsoft Corporation. All rights reserved.C:\windows\system32>diskpartMicrosoft DiskPart version 10.0.16299.15Copyright (C) Microsoft Corporation.On computer: BONNIEDAVID-PCDISKPART> list disk Disk ### Status Size Free Dyn Gpt -------- ------------- ------- ------- --- --- Disk 0 Online 1863 GB 1024 KB Disk 1 Online 3726 GB 0 B *DISKPART> list volume Volume ### Ltr Label Fs Type Size Status Info ---------- --- ----------- ----- ---------- ------- --------- -------- Volume 0 F DVD-ROM 0 B No Media Volume 1 G DVD-ROM 0 B No Media Volume 2 C NTFS Partition 1863 GB Healthy System Volume 3 D Local Disk NTFS Partition 3726 GB HealthyDISKPART> select disk 0Disk 0 is now the selected disk.DISKPART> detail diskWDC WD2003FZEX-00SRLA0Disk ID: 5BC53D8BType : SATAStatus : OnlinePath : 4Target : 0LUN ID : 0Location Path : PCIROOT(0)#PCI(1F02)#ATA(C04T00L00)Current Read-only State : NoRead-only : NoBoot Disk : YesPagefile Disk : YesHibernation File Disk : NoCrashdump Disk : YesClustered Disk : No Volume ### Ltr Label Fs Type Size Status Info ---------- --- ----------- ----- ---------- ------- --------- -------- Volume 2 C NTFS Partition 1863 GB Healthy SystemDISKPART> list partition Partition ### Type Size Offset ------------- ---------------- ------- ------- Partition 1 Primary 1863 GB 1024 KBDISKPART>