![]() In the System Information windows, select System Summary on the left and check the value of BIOS mode item on the right.In the Run dialog type msinfo32.exe and press Enter.Press Win+R keys to start the Run dialog.The best way to detect the boot mode of Windows is to do the following : x86_64 Windows boot in x86_64 UEFI mode and 32-bit Windows boot in IA32 UEFI mode. Up to Windows 10, the firmware bitness matches the bitness of Windows, ie. ALL systems pre-installed with Windows 8/8.1, 10 and 11 boot in UEFI/GPT mode.Very few late systems pre-installed with Windows 7 are known to boot in x86_64 UEFI/GPT mode by default. MOST of the systems pre-installed with Windows 7 x86_64, irrespective of Service Pack level, bitness or edition (SKU), boot in BIOS/MBR mode by default.All systems pre-installed with Windows XP, Vista or 7 32-bit, irrespective of Service Pack level, bitness, edition (SKU) or presence of UEFI support in firmware, boot in BIOS/MBR mode by default.Windows 11 only supports x86_64 and a boot in UEFI mode from GPT disk.They do not support IA32 UEFI boot, x86_64 UEFI boot from MBR disk, or BIOS boot from GPT disk. ![]() Windows 8/8.1 and 10 x86_64 versions support booting in x86_64 UEFI mode from GPT disk only, OR in BIOS mode from MBR disk only. ![]() On market, the only systems known to ship with IA32 (U)EFI are some old Intel Macs (pre-2010 models?) and Intel Atom System-on-Chip (Clover trail and Bay Trail) Windows Tablets, which boot ONLY in IA32 UEFI mode and ONLY from GPT disk. They do not support x86_64 UEFI boot from GPT/MBR disk, x86_64 UEFI boot from MBR disk, or BIOS boot from GPT disk. ![]() Windows 8/8.1 and 10 x86 32-bit support booting in IA32 UEFI mode from GPT disk only, OR in BIOS mode from MBR disk only.A good example of this is Windows 11 which still works on a BIOS/MBR configuration once the Windows Setup check is bypassed. Note: The following points only list configurations supported by the Windows Setup even though Windows itself may still work on these unsupported configurations. ![]()
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