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IRQL_NOT_LESS_OR_EQUAL (0x0000000A)
The most common cause of this blue screen is imporperly installed drivers for a newly installed piece of hardware. Fore example, if you installed a webcam two weeks ago, and have been getting BSoDs ever since, start your investigation with the webcam. First, disconnect the hardware, and uninstall the drivers for it completely. If that fixes the blue screen you can search for updated drivers or contact the manufacturer. If you havent installed any new drivers recently, you'll need to do some more detective work. Start by examining the blue screen to see if it lists a specific driver.(I omitted this section, not relevant) Looking at your blue screen, check the text at the very bottom of the screen. You'll probably see a file name. This is the driver that caused the problem. If for example, the driver in question is named nv4_dsp.dll (an nVidia related file), and you recently switched from an nVidia videocard to an ATI, then it's reasonable to assume that either the old driver was not uninstalled correctly, or the new drivers weren't properly isntalled.

Swapping Videocards
If you've narrowed down your search of offending drivers down to those associated with your videocard, turn off the system, disconnect the power, and remove and reseat the videocard. Next, go into BIOS (press F2 or Delete when your BIOS prompts you to do this) and check the bus speed for your videocard (either AGP or PCI Express, depending on your rigs hardware). The AGP bus should be locked at 33.33mhz, and the PCI-E bus should be cruising along at 100mhz. If you've overclocked your system, it can advertently knock these bus speeds beyond a stable spec, which could cause blue screens. Users are more likely to experience this IRQL error when switching from one videocard brand to another, as the drivers will conflict with each other. The safe way to swap videocards is to completely remove all remnants of your old videocard drivers using a free utility called Driver Cleaner (www.drivercleaner.net). To begin the process, click the Start menu and open the Control Panel. Double-click the Add or Remove Programs icon, highlight the videocard drivers, and click remove. Reboot the computer, holding down the F8 key to enter safe mode. Run the Driver Cleaner utility to scrub away any remnants of the previous drivers that a typical uninstall overlooks. After your reboot, install the appropriate drivers for your new videocard.

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