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I'm getting this STOP error after I updated Windows 7 using Windows Update. I made a system restore in order to try to solve temporarily. I don't want to stay outdated and exposed, so I searched and found this page about the error, IRQL GT ZERO AT SYSTEM SERVICE 0x0000004a.

The problem is that it does not help me understand what the real problem is. For now I want to install all updates since 5 January 2013 except the problematic one, but the combinations are 20!(factorial) which is an insane amount.

Do you know which recent Windows 7 Update may have caused this?


  • OS: Windows 6.1 build 6001 (SP1) Home edition
  • Technical details of the STOP error

    Bugcheck: 0x0000004a (0x00000000746e2e09, 0x0000000000000002, 0x0000000000000000, 0xfffff8800c3a2c60)  
    Report ID: 011713-66674-01
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This indicates that a thread is returning to user mode from a system call when its IRQL is still above PASSIVE_LEVEL – Snesticle Jan 17 '13 at 16:05
@Snesticle That's what I thought. But what's the cause of it? If it a faulty windows update? Was it an update that wasn't properly applied? ...? – brunoais Jan 17 '13 at 16:07
Just install one update at a time. Since every single update creates a system restore point before its installed the process should only take an hour at most. – Ramhound Jan 17 '13 at 16:08
Do what Ramhound just said. The hex code in parentheses next to the 0x0000004a should supply the current IRQL but I'm a GNU guy so I'm not much help there. – Snesticle Jan 17 '13 at 16:12
If I had to take a guess I would say that an update conflicted with one of your hardware drivers but that's pure speculation. – Snesticle Jan 17 '13 at 16:14

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