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The most serious problem that your PC can have is appearance of a Blue Screen of Death error accompanied by windows irql not less or equal error. It can signify the end times of your Computer system as it depicts a really critical state necessitating immediate rectification. However, the problem can luckily be fixed.

This kind of error message is an indication that your system driver had initiated an attempt to have an access to the memory which was restricted. This can also be the case for a kernel-mode process whose permission to access the memory address is denied. A corrupted pointer that makes incorrect references in memory location is the main cause of this error. Generally, a computer program makes use of a pointer variable when referring to a block of memory stored in it. Having an incorrect value on a pointer directs the pointer to access a memory which it has no permission of access.  Occurrence of this error while in user mode leads to an access violation whereas in kernel mode, a stop irql Not Less Or Equal is generated. It is also be experienced when upgrading a recent version in your windows which is incompatible with your drivers, virus scanner or a back up tools.
As noted, installation of buggy drivers in your system is the primary cause of windows irql not less or equal. There are a number of actions you can take to resolve it and one of them is performing a clean reboot on your system. This means that your operating system will only be started using startup services on your system that are basically essential. To achieve this, adjusting your service settings is the only option you have. This restricts any malfunctioning software from running during windows startup that leads to the error.
Junk configuration entries in the registry can also lead to appearance of the error. Deleting these outdated entries using registry cleaner software can fix this error. The software can be downloaded and running a full scan in your system is essential. Having unsupported CMOS features in your system can damage the integrated circuits of your PC leading to appearance of this error. These features are enabled during the default state of CMOS settings. These may lead to settings that fail to match your hardware and turning them off is the only option you have. As noted earlier on, this error may also appear when some devices in your PC are not working properly. It is essential to isolate which hardwares are not working properly by disconnecting them and reconnecting them one by one and making a note of each. Replacements of the faulty devices will definitely stop the error from resurfacing.
Significant files in your PC may be mistakenly moved or deleted which may also give rise to this problem. So, it is essential to repair installation in your windows to fix this problem. This can be achieved by booting your computer from windows installation DVD ROM and setting up programs in your PC. Just like many other computer errors, windows irql not less or equal can be prevented by careful maintenance of your computer system.

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