PxHlpa64.sys preventing core isolation

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  1. Hoosier Daddy
    Posts : 48
    Windows 10 Pro 64
       New #1

    PxHlpa64.sys preventing core isolation


    2012 time stamp. Internet search says possibly from Sonic owned by Corel. I may have installed something from Sonic many versions of Windows ago.

    Windows 10 Pro completely up to date. I5-9600K.

    I thought it would be easy to fix by unchecking PxHlpa64.sys in AutoRuns. But that just keeps it from loading. Still gets flagged by Core Isolation. Can't rename it or associated cat with windows running. Hate to do it anyway on or offline and maybe cause some side effect.

    Least useless advice internet search got me was to open all x hundred devices in device manager and look at the drivers of each, then uninstall the driver from there when you find it. Sort of like finding who has a particular phone number by reading the white pages.

    Aside from not believing that's the easiest way to get rid of a useless driver, I suspect I could spend hours looking at every device driver in Device Manager and never find it there.

    For personal betterment, is there a way to find out what #$&* device is associated with a specific driver?

    For solving the problem how the heck do I get rid of this useless driver?

    - - - Updated - - -

    More search says it could be related to DVD drives, so I went there in Device Manager and sure enough. A brand new Blu-Ray drive uses the driver. ^%&*.

    I uninstalled the device and rebooted. Still can't turn on Core isolation because of the driver. So, figured maybe its reinstalling itself on boot, so went into BIOS and disabled the SATA port its on. Core isolation still fails because of the driver.
    Last edited by Hoosier Daddy; 01 Sep 2021 at 21:39.
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  3. bobkn
    Posts : 4,453
    Win 11 Pro 22000.708
       New #2

    Does this have any connection with your reality? ReviverSoft | Pxhlpa64.sys Process - What is Pxhlpa64.sys? - Reviversoft

    It may be possible to rename the file, adding .old.

    If it's in the Driver Store, you may be able to get rid of it using the Driver Store Explorer. GitHub - lostindark/DriverStoreExplorer: Driver Store Explorer [RAPR] It is not very easy to use.

    Prepping for Windows 11?
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  4. Hoosier Daddy
    Posts : 48
    Windows 10 Pro 64
    Thread Starter
       New #3

    Looks like the driver is also used by Microsoft Virtual DVD-ROM. Update request reports all drivers are best available. I'm going to try uninstalling Microsoft Virtual DVD-ROM in Device Manager. Hope I'm not doing anything that prevents ever adding an optical drive.

    - - - Updated - - -

    bobkn said:
    It may be possible to rename the file, adding .old.
    No, per my original post, it can not be renamed while Windows is running and nervous about renaming it after booting something else.

    And we posted at about the same time, that I found its actually used by Microsoft Virtual DVD-ROM and MS says its the latest and greatest.
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  6. bobkn
    Posts : 4,453
    Win 11 Pro 22000.708
       New #4

    Hoosier Daddy said:
    Looks like the driver is also used by Microsoft Virtual DVD-ROM. Update request reports all drivers are best available. I'm going to try uninstalling Microsoft Virtual DVD-ROM in Device Manager. Hope I'm not doing anything that prevents ever adding an optical drive.

    - - - Updated - - -


    No, per my original post, it can not be renamed while Windows is running and nervous about renaming it after booting something else.

    And we posted at about the same time, that I found its actually used by Microsoft Virtual DVD-ROM and MS says its the latest and greatest.
    Strange. I haven't checked my Win10 desktop, but it is not present on this machine, which is running Windows 11 22000.168. (Clean install of 22000.51, since updated.)

    I have an optical drive (BD burner), which continues to work.

    The machine has all device security enabled, including core isolation.
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  7. SoFine409
    Posts : 1,524
    Win10 Pro
       New #5

    @Hoosier Daddy take a look here PxHlpa64.sys Windows process - What is it? it indicates that it can be turned off in Services and says that it’s not critical to Windows. You can always enable it again in services if it causes you problems. Do you have Rixio installed?
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  8. Hoosier Daddy
    Posts : 48
    Windows 10 Pro 64
    Thread Starter
       New #6

    SoFine409 said:
    @Hoosier Daddy take a look here PxHlpa64.sys Windows process - What is it? it indicates that it can be turned off in Services and says that it’s not critical to Windows. You can always enable it again in services if it causes you problems.
    Thanks. Been there done that before posting.

    And I have now uninstalled Microsoft Virtual DVD-ROM. And that driver is still given as the reason Core isolation can't be turned on.

    This is getting nuts.

    - - - Updated - - -

    bobkn said:
    I have an optical drive (BD burner), which continues to work.

    The machine has all device security enabled, including core isolation.
    What drivers are shown for Microsoft Virtual DVD-ROM in Device Manager?
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  9. bobkn
    Posts : 4,453
    Win 11 Pro 22000.708
       New #7

    Hoosier Daddy said:
    (snip)

    What drivers are shown for Microsoft Virtual DVD-ROM in Device Manager?
    The driver PxHlpa64.sys is not present on my Win 10 desktop.

    Microsoft Virtual DVD-ROM appears in Device Manager (as as optical drive) only when I have mounted an ISO. Then, the driver is cdrom.sys, just like for my real optical drive.

    I suspect that PxHlpa64.sys is a leftover, but I'm unsure from what.
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  10. SoFine409
    Posts : 1,524
    Win10 Pro
       New #8

    bobkn said:
    The driver PxHlpa64.sys is not present on my Win 10 desktop.

    Microsoft Virtual DVD-ROM appears in Device Manager (as as optical drive) only when I have mounted an ISO. Then, the driver is cdrom.sys, just like for my real optical drive.

    I suspect that PxHlpa64.sys is a leftover, but I'm unsure from what.
    From the link I posted previously:

    PxHlpa64.sys file information
    The process known as Px Engine Device Driver for (version 64-bit Windows, 64-bit (x86-64) Windows) or PxHlpa64belongs to software PxHelp64 or Roxio Burn by Sonic Solutions (Sonic Fiber-optic Internet & Phone) or Rovi or Corel (Corel Corporation).
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  12. Hoosier Daddy
    Posts : 48
    Windows 10 Pro 64
    Thread Starter
       New #9

    Did more searching/reading. Found discussions regarding registry entries named LowerFilters and UpperFilters. Reading between the lines seem to indicate they are a way to add drivers before or after whatever Windows thinks are needed. I renamed every one of those containing this driver name. Just added "Was" prefix to the entry name. Not that many. Reboot. No help.

    So I deleted registry entries for services named PxHlpa64. There were two. Reboot. Was then able to turn on isolation.

    Rebooted again to BIOS to re-enable the SATA port for the BluRay burner. Drive shows up now. Properties show only a single MS driver.

    Event viewer shows no issues.

    Still can't rename or delete the driver file itself, but I can live with that.
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  13. Steve C
    Posts : 7,904
    Windows 11 Pro 64 bit
       New #10

    I just had the same issue trying to enable Core Isolation in friends laptop. I just disabled PxHlpa64.sys in Autoruns and renamed PxHlpa64.sys in windows\system\32\drivers.

    I wish I knew what software it related to so I can uninstall it.
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