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Logon UI.exe corrupt file 0xc000012 error

By Atham
Sep 20, 2011
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  1. Hello,
    today I went to switch on my PC to do my homework, when a message popped up. It said that the logon UI.exe corrupt file. I clicked okay and a message coded 0xc000012 appeared.

    I am currently trying to access via safe mode and see if it works.

    I will post it as soon as it boots up.

    Thanks in advance

    EDIT: Didn't boot. Turned the PC off, switched off the PSU and took out the plug
     
  2. Route44

    Route44 TechSpot Ambassador Posts: 11,966   +70

    0x12: TRAP_CAUSE_UNKNOWN
    This indicates that an unknown exception has occurred. A hardware device, its driver, or related software might have caused this error.

    The fact that you were able to boot into safe mode means we are most likely dealing with a driver.

    Can you boot into Safe Mode now?


    Have you experienced any infections lately?


    Do you have your Windows OS disk? Have you tried a Restore Point?
     
    Atomicabe likes this.
  3. Atham

    Atham TS Enthusiast Topic Starter Posts: 460

    I cannot seem to boot. I waited for about a minute. Was that too short? I do have an OS disk
     
  4. Route44

    Route44 TechSpot Ambassador Posts: 11,966   +70

    LogonUI.exe implements the graphical user interface shown when a user is asked to log in to the local machine. If it is corrupted it won't allow boot-up.

    Before proceeding did you recently have any infections lately?
     
  5. Atham

    Atham TS Enthusiast Topic Starter Posts: 460

    No. I put once a Windows 8 64 bit preview cd to see if it boots, but then my pc worked.

    Would using the repair option help?
     
  6. Route44

    Route44 TechSpot Ambassador Posts: 11,966   +70

    I would say therein lies your issue. That preview CD most likely corrupted LogonUI.exe.

    What is your OS disk?
     
  7. Atham

    Atham TS Enthusiast Topic Starter Posts: 460

    Installed I have a 32 bit. On a CD I have a 64 bit. I have made some partitions, ready to install 64 bit. But I took the CD out and my PC worked yesterday.
     
  8. Route44

    Route44 TechSpot Ambassador Posts: 11,966   +70

  9. Atham

    Atham TS Enthusiast Topic Starter Posts: 460

    I meant the one found when zou press F8 before windows logo appears.
     
  10. Atham

    Atham TS Enthusiast Topic Starter Posts: 460

    The PC did a check of the Local Disk C:

    When it reseted it said that ole32.dll is missing. Now, when I turn on my PC my display shows nothing. Please help.
     
  11. Route44

    Route44 TechSpot Ambassador Posts: 11,966   +70

    Is the 64 bit CD an upgrade or a full version?
     
  12. Atham

    Atham TS Enthusiast Topic Starter Posts: 460

    I did a clean installation with some files backed up and everything works fine now. I have windows 7 Ultimate 64 bit now and it works like a charm.
    Thanks for your help Route44.
     
  13. Route44

    Route44 TechSpot Ambassador Posts: 11,966   +70

    You did what I was going to suggest! Thus my question. Good job. :grinthumb
     
  14. Atham

    Atham TS Enthusiast Topic Starter Posts: 460

    Thanks once again.
     
  15. Atomicabe

    Atomicabe TS Rookie

    help I HAVE THE SAME PROBLEM

    Plz help mw I HAVE ERROR0xc000012
     
    Last edited by a moderator: Sep 7, 2016

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