What is PxHlpa64.sys and How to Uninstall it

PxHlpa64.sys is a module supplied with DVD-burning programs, such as Roxio/Sonic, which Corel Corporation now owns. The PxEngine is also licensed by various 3rd-party software developers specializing in disc burning software. Other programs, such as Adobe Premiere Elements, appear to utilize this module for DVD-burning capabilities.

This driver is flagged as incompatible when you try to enable Memory Integrity. This driver is also known to cause the 0xC1900101 errors during the Windows 11 setup.

Resolution

PxHlpa64.sys is part of the PxEngine library, used by Roxio products for burning optical discs. To uninstall the PxHlpa64.sys driver, uninstall the disc burning program that installed the PxHlpa64.sys driver.

Suppose the corresponding software is no longer available or the manufacturer does not have the latest version of the PxHlpa64.sys driver that supports the Core isolation feature. In that case, you must uninstall the driver manually in order to enable Memory Integrity.

Please create a System Restore Point and follow one of the methods below to delete the PxHlpa64 driver service.

Option 1: Uninstall PxHlpa64.sys using a REG file

1. Download pxhlpa64_uninstall.reg (zipped)
2. Unzip and run the enclosed REG file.
3. Click Yes to confirm.
4. Restart Windows for the changes to take effect.
5. After restarting Windows, rename or delete the following file:

   C:\WINDOWS\system32\drivers\PxHlpa64.sys

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Option 2: Uninstall PxHlpa64.sys using Command Prompt

To delete the PxHlpa64.sys driver service, run this command from an admin Command Prompt window:

sc.exe delete PxHlpa64

Then, run the two commands below to delete the “PxHlpa64” filter driver reference in the registry and rename the driver file:

reg.exe delete "HKLM\SYSTEM\CurrentControlSet\Control\Class\{4d36e965-e325-11ce-bfc1-08002be10318}" /v "LowerFilters" /f

ren C:\WINDOWS\system32\drivers\PxHlpa64.sys PxHlpa64.sys.old

Note: You should see the output message “The operation completed successfully” for the “reg.exe” command-line above.

Restart Windows and see if you can enable Memory Integrity.

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References

Fix: Cannot Enable Core Isolation Due to Incompatible Drivers

Error “Sorry, there was a problem mounting the file” after deleting PcHlpa64.sys

You cannot enable the Windows Memory Integrity feature because PxHlpa64.sys is not compatible.