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When did you first get this error ?
What did you do or what did a program do, or what did you install just before you got this error ?
You can get the DRIVER_IRQL_NOT_LESS_OR_EQUAL error from many causes, but sometimes it can be just because the ram module contacts are not getting a good connection.
A common thing that can happen with ram, even ram that worked fine previously, is the ram has, or has developed, a poor connection in it's slot(s).
This usually happens a long time after the ram was installed, but it can happen with new ram, or after moving the computer case from one place to another, and I've had even new modules that needed to have their contacts cleaned.
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
For a laptop, you must remove both its main battery and AC adapter before you do that.
See the User's or Owner's manual for your model if you have a brand name system, or the mboard manual if you have a generic desktop system, if you need more info about how to properly remove and install the ram.
NOTE that I'm assuming you DID NOT change which ram you have installed just before you got this error. If you DID do that, the ram you installed may NOT be 100% compatible with you using it in the mboard - try installing ONLY the ram you had in it before, if you still have it, to see if the problem goes away.
If that doesn't help, search the web with:
to find possible causes.