Error Message: “STOP: 0x0000000A irql_not_less_or_equal.”
This particular error message is generally appear when you are upgrading your system from Windows 98/Me to Windows XP.
The term IRQL refers to interrupt request lines which are actually the communication channel through which computer hardware devices communicate With the CPU. So whenever a device needs a CPU attention, it uses an interrupt request to let the CPU know that it has data that requires handling. So it is obvious that this error message indicates a problem with some hardware or device drivers.
Solution: The main cause of this problem is an incompatible hardware device or device driver. To resolve this problem just restart your computer and try to get back to your previous Windows version and uninstall any antivirus, boot manager software and clean boot your PC.
In any case if you can’t able to get into your previous version of Operating System then remove every unnecessary piece of hardware from your system. This includes USB (Universal Serial Bus) devices to sound cards and network cards. If still you can’t able to install XP then try flashing your BIOS to a new version. You have to consult your computer’s manufacturer to figure out how to do this.