Irql_not_less_or_equal blue screen

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Thread Starter
Dec 14, 2002

I have a Dell Studio XPS 13 and after getting a virus I reinstalled Vista. Install goes fine, drivers too, but once I update Windows I get a blue screen saying "Irql_not_less_or_equal" apon reboot. Once in safe mode I was shown this:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6001.
Locale ID: 1033

Additional information about the problem:
BCCode: a
BCP1: 00000000656C6473
BCP2: 000000000000000C
BCP3: 0000000000000000
BCP4: FFFFF80001C636B3
OS Version: 6_0_6001
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:

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Any idea?

Thank you very much.
Oct 4, 2008
IRQL_NOT_LESS_OR_EQUAL is usually just a case of overheating or a memory error. Try not to keep the system really hot for a prolonged period of time (This has happened to me a lot). If that requires replacing the CPU fan, then do it, although just avoiding excessive heat to build up on your laptop will do fine.

If not, try posting the minidump file (C:\Windows\Minidump\Mini041110-01.dmp) to see if the problem could be narrowed down.
Dec 9, 2000
The error type does not really exclude anything, but sometimes a bugcheck analysis will reveal a specific non-windows faulting driver -- or else give other clues as to the source. Security programs are often a good bet for this type error especially after updates or installs that are not "clean" installs.

If it follows a "clean" install you should be looking at hardware issues such as faulty memory or overheating (mostly if it occurs under high stress situations).

I can run a debugging utility on the dump files if you do this:

1 > create a new folder on the desktop and call it "dumpcheck" or whatever you like
2 > navigate to c:\windows\minidump and copy the last few minidump files to that folder. *this assumes 'c' is your boot drive, if it is not, subsitute accordingly
3 > close the folder and right click on it and select Send to Compressed (zipped) Folder.
4 > use the "manage attachments" in the "advanced" reply window to upload that zip file here as an attachment.

If you do not see any minidumps, be sure you are not using any cache cleaner such as CCleaner. Also run sysdm.cpl and select Advanced > Startup and Recovery. Make sure "small memory dump" is the one chosen under "write debugging information" and the location should be %systemroot%\minidump

Since almost all bugchecks can be caused by faulty ram, I would recommend you perform memory tests.

On Vista and Win7 you can run mdsched.exe -- once rebooted to the scanner press F1 for Advanced options and run the "extended" tests.

Another, some think better, program that can be used on all operating systems is memtest86

Beginners Guides: Diagnosing Bad Memory

Memtest86 - A Stand-alone Memory Diagnostic
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