Incorrect low-level configurations often trigger the IRQL error when Windows tries to communicate with the motherboard.
IRQL_NOT_LESS_OR_EQUAL (Stop Code: 0xA) error during a Windows 10 installation typically occurs when a device driver or system memory attempts to access an invalid memory address while at a raised interrupt request level. Because this happens during the setup process, it often points to hardware incompatibility, faulty RAM, or corrupt installation media. Microsoft Learn Primary Causes During Installation Memory Issues
: This is the definitive technical documentation. It explains that the error occurs when a kernel-mode process or driver attempts to access a memory location at an interrupt request level (IRQL) that is too high.