Irql_Not_Less_Or_Equal
Have you ever seen that blue screen with some text in there including odd Irql_Not_Less_Or_Equal? It is called Blue Screen of Death. When all of a sudden you see the blue screen, prepare to restart it. This BSoD error is quite common and there are few causes that contribute to this error.
First of all, your PC could be getting too hot. Look at your PC or laptop and see if it is running hot. Go and buy a cooling fan if you believe temperature is too high.
Second and most typical cause of Irql_Not_Less_Or_Equal is an issue with Windows registry. It is difficult to fix this problem on your own unless you are an absolute computer specialist. Fortunately, there are some tools that help to fix Blue Screen of Death.
Other causes could be related with your memory. Try to get decent, reliable memory. Take out the old one and test new one in the system for a while. If you do not see the blue screen for a while, wrap old memory and mail it to your worst enemy.
Some people would try to take a shortcut and simply format their hard drives and reinstall Windows. But usually you would have many programs installed in your system and it would be a pain to reinstall them again. Do your best to resolve the error before you come to a decision to re-intall Windows.
Read more about BSoD and how to fix it. Find out what registry cleaner can help you get rid of the problem very quickly. Try to fix your registry first before you start looking at your hardware. It would be a pity to purchase cooling fan and memory just to find out that Irql_Not_Less_Or_Equal was caused by Windows registry issue.