Driver_irql_not_less_or_equal - USBPORT.SYS - address F67678F0 base at F6761000, datestamp 41107d62

Recently I have begun receiving this bsod on shut down for no apparent reason.  I have not updated or changed any drivers on my system or added any new equipment recently.  However, I have noticed that one of the 6 USB ports on my system appears to have gone bad or is not working.  My system hardware, (older machine):
ASUS A8V Deluxe
AMD64 3500+
1GB Crucial Ballistix
GeForce 6800 Ultra
Windows XP SP2 and all latest updates
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USB ports do go bad, you can try switching devices on the ports, but in the end, you will probably have to give up on using that particular port.
BSOD crashes like this are often associated with hardware problems - RAM, motherboard or expansion cards.

Is there any pattern to the problem - on time or specific applications?

I suggest you run a memory test using Memtest ( - run it off a floppy with logging enabled so that any other system software is out of the picture.

You could try running off the UBCD for Windows here ( - this will also remove any software dependencies.

You could also download a test utility such as Everest (trial version at or Burn-in (trial version at  There are many other utilities like this - these are just a couple that I am familiar with.

As a footnote, you said 'I have not updated or changed any drivers on my system or added any new equipment recently.'

True, but you do have Windows Update turned on - it's possible that one of the Windows updates is causing this problem.

However, this seems unlikely - the drivers on the ASUS site are dated 2005 and before (except for a beta BIOS dated 2007).


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I second that memory test suggestion, although you may need to go so far as to pull DIMMs as I have had a couple of memory issues that testing didn't find. I've gotten the Driver_irql_not_less_or_equal error a few times in the past few years and every time but one it was bad RAM; the exception was a bad motherboard.
DnemonixAuthor Commented:
Thank you all for your comments as they are appreciated.  Not sure what the solution is since i have pulled the ram/ran memtest without issue.  Curiously, I have looked deeper into the issue and have found the problems began when purchasing then installing Norton SystemWorks 2008.  Upon further investigation whenever I try to run a virus scan, the machine bsod's and I get a similar error as indicated above though no explanation is given, (nothing related to USB).  I guess the solution would be to remove Norton and see if the errors continue.  Thank you all again for your efforts.
DnemonixAuthor Commented:
Thank you for your suggestions as they are appreciated.
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