SFC /SCANNOW Command - System File Checker

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  1. Clovis5119
    Posts : 9
    Windows 8 64-bit
       New #490

    So I've made an interesting discovery.

    My keyboard is completely unresponsive in the Startup Options screen. I tried plugging it in different USB ports but to no avail. But it works fine otherwise.

    This could be related to the previous BSOD errors I was having related to Hidclass.sys after running Driver Verifier, which - I think - means I'm having issues with USB drivers. But I have no idea how I would go about resolving that problem, as those seem strangely difficult to update/fix.

    I know this is not on-topic with the thread, but do you have any recommendations for me?
    Last edited by Clovis5119; 14 Aug 2013 at 22:17.
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  3. Brink
    Posts : 72,856
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       New #491

    Do you have an old PS/2 keyboard that you could use temporarily to see if you are able to run a SFC scan at boot with?

    If not, then you could try doing a system restore (at boot if needed) using a restore point (if available) dated before this issue to see if it may help before having to move on to more drastic measures.
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  4. djbillyd
    Posts : 47
    Windows 7 Ultimate 64-bit
       New #492

    SFC /SCANNOW Command


    This is an awesome thread! Man! Brink, I wanna be just like you when I grow up!!!
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  5. Clovis5119
    Posts : 9
    Windows 8 64-bit
       New #493

    Brink said:
    Do you have an old PS/2 keyboard that you could use temporarily to see if you are able to run a SFC scan at boot with?

    If not, then you could try doing a system restore (at boot if needed) using a restore point (if available) dated before this issue to see if it may help before having to move on to more drastic measures.
    Hi Brink,

    I was able to launch the command prompt at boot but the SFC scan still returned the same error.

    I doubt a system restore will be of much use. I had been having regular BSOD issues (at a rate of about 1 per 2 days) since I built this PC. After figuring out how to read my minidump files, I found that almost all were being caused by my Network driver, which I have since updated, causing a drastic reduction in the rate of crashes.

    The BSODs since always return one of the the following errors and usually occur during boot or very shortly after boot: PFN_LIST_CORRUPT, MEMORY_MANAGEMENT, DRIVER_IRQ_NOT_LESS_OR_EQUAL. I ran Memtest and the Windows Memory Diagnostic Tool but both came out clean. I also made sure that my RAM was receiving the proper voltage and that all of my drivers were up to date.

    Yesterday I tried to run Driver Verifier but it caused the PC to crash upon each boot attempt until the OS automatically forced a system restore to two days prior. I found that the crashes were being caused by a Daemon Tools driver and removed the application.

    I then tried to run Driver Verifier again. This time the computer could boot to the Desktop but would then crash within 5 seconds of doing so, reporting an DRIVER_VERIFIER_IOMANAGER_VIOLATION (Hidclass.sys) error.

    And that's basically where I am right now.
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  7. Brink
    Posts : 72,856
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       New #494

    Clovis,

    You might consider doing a clean install to start fresh.

    Otherwise, you might post in the BSOD Help and Support forum area to see if we may be able to help with that issue.
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  8. Clovis5119
    Posts : 9
    Windows 8 64-bit
       New #495

    Hi Brink,

    I was able to run the System File Checker.

    Once the process was completed, SFC reported there were some files it could not repair.

    I followed the directions in Option Three to find the files the system could not repair, but sfcdetails.txt turned out empty. I've attached a copy of CBS.log to this post.

    Thoughts?
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  9. Brink
    Posts : 72,856
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       New #496

    Hello Clovis,

    Did you run SFC at boot, in Safe Mode, or in Windows 7? If not in Windows 7, then you may not get a log file.

    If you are still getting BSODs, then I would recommend to post a new thread BSOD Help and Support forum area to get that sorted first.

    Blue Screen of Death (BSOD) Posting Instructions
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  11. Clovis5119
    Posts : 9
    Windows 8 64-bit
       New #497

    Brink said:
    Hello Clovis,

    Did you run SFC at boot, in Safe Mode, or in Windows 7? If not in Windows 7, then you may not get a log file.

    If you are still getting BSODs, then I would recommend to post a new thread BSOD Help and Support forum area to get that sorted first.

    Blue Screen of Death (BSOD) Posting Instructions
    Ran it in Safe Mode.
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  12. Brink
    Posts : 72,856
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       New #498

    Ah, that's why there's no log then.
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  13. Joeaa
    Posts : 56
    Windows 7 Home Premium 64bit
       New #499

    Did a sfc /scannow . I got the file using copy cbs.log a.txt
    Question: How can I read it. What tells me what was replaced.
    or what was not replaced?

    It said, it was successful
    Joe
    Last edited by Joeaa; 25 Aug 2013 at 19:57.
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I hope this will be a help to some and I would appreciate any feed-back. :) SFC /SCANNOW : Run in Command Prompt at Boot Edit: I've just added a Method Two to this. :)
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