PxHlpa64.sys preventing core isolation

PxHlpa64.sys driver may also be included in certain Adobe software, especially Photoshop Elements or even Adobe Encore CS5/CS6

Hoosier Daddy said:

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.

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If I search PxHlpa64 in regedit, there are many entries. I previously deleted them and had to restore from a backuo as I could not recover my DVD writer. It was seen as a cd-rom only. I tried everything ... Could you give more details on which 2 entries you deleted ? You mentionned that you had to go to the bios, before going there what was the problem with your dvd ?

Thanks

In my case, I think I solved it by going to C:\Windows\System32\drivers and finding the PxHlpa64.sys driver and renaming that to PxHlpa64.sys.old. Then I scanned again with Core Isolation, and it prompted me to restart. I'm about to restart now. If it breaks something now or later, I'll report back.

EDIT: Restart was SUCCESSFUL! Device Security and Core Isolation now have green checkmarks, and Memory Integrity is On. And I didn't have to disable Virtualization, as I thought I would have to (Dell requires me to enter BitLocker key to do that).

Thanks for the update, ensure that your DVD is working.

I deleted the PxHlpa64.sys, after reboot, I had lost the DVD writer, error code 39. I copied back PxHlpa44.sys and DVD became functional. So to me there's no choice : PxHlpa64.sys is required with a DVD. I searched the internet and after many hours, I found nothing to replace this required files for a DVD writer.

jgveill said:

Thanks for the update, ensure that your DVD is working.

I deleted the PxHlpa64.sys, after reboot, I had lost the DVD writer, error code 39. I copied back PxHlpa44.sys and DVD became functional. So to me there's no choice : PxHlpa64.sys is required with a DVD. I searched the internet and after many hours, I found nothing to replace this required files for a DVD writer.

After reading your message, I thought "well how does it work on Win 11?". So, on my desktop, I went to the drivers folder and found that there is no PxHlpa64.sys driver. Then again, I haven't tried to burn a DVD for a little while, and my laptop does not have an optical drive (damn you future). My desktop has a Blu-Ray writer in it. So, it must be some Backwards Compatibility thing in Win 10. P.S. I wonder if there is a firmware update somewhere for your DVD writer. There was for my Blu-Ray writer.

Windows 11 may the the problem ... My experience is with 2 different W11 computers having 2 different DVD writers (Asus and Liteon) with the same conclusion.

jgveill said:

Windows 11 may the the problem ... My experience is with 2 different W11 computers having 2 different DVD writers (Asus and Liteon) with the same conclusion.

I wonder if you can copy and paste/replace the entire list of drivers in C:\Windows\System32\drivers from a fresh install of Win 11 or the ISO to an upgraded (Win 10-to-11) computer. There has to be a comparable driver or it would be more widespread amongst people who do fresh installs of 11 with a DVD Writer attached. I'm just grasping at straws at this point.

good idea ... but I don't have any fresh W11 install and I do not want to reinstall W11. I also have seen someone saying that this driver was in a fresh windows install even if he did not have any dvd writer. I just hope that Microsoft will eventually fix this. I imagine they know the problem as they made an "ignore" in the windows security to workaround non compatible drivers.

Thanks

I have a HP computer with a clean Windows 11 installation and it does not have PxHlpa64.sys
Also have a new Dell computer with Win 11, but additional software was installed since I got it, and this one does have the PxHlpa64.sys so I cannot turn on the Memory Integrity.
In Program Files (x86), Common Files I have 2 folders that were installed on 25 March - one is PX Storage Engine and the other is Sonic Shared. ( Sonic Shared contains PxHlpa64.sys )
Now if I look at what programs were installed on 25 March I see Macrium Reflect, Mp3tag, Photodex Presenter, ProShow Producer and Tweaking.com Envelope Printer.
Maybe someone else could check if they are using any of these programs as it seems like one of them has installed the Sonic Shared.
Also if I look at Device Manager DVD-CD driver file details I see 2 drivers ( cdrom.sys and PxHlpa64.sys ). I really don't think the DVD needs 2 drivers ??