I'm trying to install Windows 11 from a bootable USB drive. My system has an x64 processor, 10 GB of RAM, and about 72 GB free on the C: drive where I want to install it. I set the USB hard drive as the first boot device and also selected it manually from the boot menu. The computer displays the Windows logo for a while, then restarts and repeats the cycle. If I leave the keyboard alone, it eventually boots into my existing Windows installation instead. I created the installer again using Microsoft's official Media Creation Tool after initially trying Rufus, but the behavior did not change. What should I check to determine whether the hardware, boot mode, or installation media is causing this?
3 Answers
“x64” only tells us that the processor supports 64-bit software; it doesn't tell us whether the CPU is supported by Windows 11. The exact CPU and motherboard model are important, along with whether TPM 2.0 and Secure Boot are available and enabled. An older 64-bit processor can still be incompatible with Windows 11, which may explain why the installer will not proceed normally.
The available storage may also be a problem. Windows 11 officially requires at least 64 GB of storage, but 72 GB free on the current system drive leaves very little room for the installation, updates, recovery files, and normal use. If possible, use a larger drive and make a full backup before changing partitions or attempting a clean installation.
Since both Rufus and the official creation tool produce the same result, the USB image is less likely to be the main issue. Check whether the firmware is set to UEFI mode rather than Legacy or CSM, and recreate the USB using a different flash drive if available. Also verify that the computer can boot another known-good installer or diagnostic USB. If the machine is too old for UEFI, TPM 2.0, Secure Boot, or a supported processor, Windows 11 may require unsupported workarounds and may still be unreliable.

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