| Step | Action | |------|--------| | 1 | Recreate USB with Media Creation Tool | | 2 | Test RAM (single stick, swap slots) | | 3 | Load BIOS defaults, disable overclocking | | 4 | Change SATA mode (AHCI ↔ IDE) | | 5 | Disconnect all non-essential hardware | | 6 | Update BIOS | | 7 | Try a different hard drive/SSD |
If you have multiple internal HDDs or SSDs, disconnect all of them except the one you are installing Windows onto. 2. Verify Your Installation Media
A "bad" USB drive or a corrupted ISO file is a common cause for this specific error during setup. irql-not-less-or-equal when installing windows 10
Use the official Windows 10 Media Creation Tool to re-flash your drive.
: Use the Windows 10 Media Creation Tool to burn a fresh USB. A corrupted installer can trigger memory access errors. | Step | Action | |------|--------| | 1
If you suspect the RAM is the issue, you can run the Windows Memory Diagnostic from another PC or use MemTest86 to confirm the hardware is healthy. Summary Checklist Potential Cause Faulty RAM Test with one stick at a time. USB Corruption Re-download the ISO and use a new USB drive. BIOS Conflict Update BIOS and disable all overclocks/XMP. External Devices Unplug everything except keyboard and mouse.
Replace the RAM stick. If you have multiple sticks, test each one individually. Use the official Windows 10 Media Creation Tool
Do not skip the memory test. It is the single most effective diagnostic tool for this specific stop code.
To prevent the "IRQL Not Less or Equal" error from occurring in the future, ensure that:
Before you start blaming Windows 10, you need to eliminate hardware variables. The installer is extremely sensitive to unstable hardware. The goal here is to get the installation to complete with the absolute minimum components.