Core Isolation turned off due to WDCSAM64_PREWIN8.SYS incompatibility

Anonymous
2022-09-02T19:09:56+00:00

I have been running Windows 11 successfully on my Microsoft Surface for some time now with no problems.

Within the last day or so, I all of a sudden got a notification that Core Isolation has been disabled due to an incompatible driver, WDCSAM64_PREWIN8.SYS.

From what I can see, this driver is related to Western Digital. However, I do not have any Western Digital devices attached to my Surface, nor have I recently added/installed anything from Western Digital.

I have tried searching for this driver but have come up empty.

Surface | Surface Pro | Safety and security

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

0 comments
Answer accepted by question author
Anonymous
2022-11-28T10:37:21+00:00
  1. Select the Startbutton and type “Core isolation”.
  2. Select the Core Isolation system settings from the search results to open the Windows security app.

On the Core isolation page, you’ll find Memory integrity along with the toggle to turn it on

  • If you receive a notification / message says that the memory integrity can't be turn on follow the below steps.
  1. Try to scan and fix.
  2. If it is not solved, please click on "Review any driver incompatibilities".

3.We can see a driver or more.

  1. Please note the published name here is "oem46.inf"
  2. Select the Start button and type “Device Manager" and follow as shown below.

  1. Select the right driver from Device manager"oem46.inf" and right click and select remove driver.

Example :-

7. System needs to be restarted after removal of the driver.

Hopefully this will solve your issues no need to install any software for this.

Was this answer helpful?

400+ people found this answer helpful.
0 comments

168 additional answers

Sort by: Oldest
Most helpful Newest Oldest
  1. Anonymous
    2022-09-26T13:33:40+00:00

    Thanks! This worked for me to delete the offending driver, using a program called DriverStoreExplorer!

    [SOLVED] Unable Turn On Memory Integrity | Review Incompatible Drivers | Core Isolation Issue - Bing video

    Thanks. Problem is resolved on my laptop too. Very well written blog.

    Was this answer helpful?

    0 comments
  2. Anonymous
    2022-09-27T04:29:13+00:00

    AS noted in the above link, I had to add "/force" to the command to have it work on my Surface7 pro Win 11.

    SOLVED.

    Was this answer helpful?

    0 comments
  3. Anonymous
    2022-09-29T13:42:28+00:00

    I'm having the same issue with both wdcsam64_prewin8.sys (oem397.inf) as well as a driver called ftdibus.sys (oem399.inf).

    When trying what has been suggested here, this is the result:

    Was this answer helpful?

    0 comments
  4. Anonymous
    2022-09-29T21:35:42+00:00

    I tried all the solutions that LurkingZombie_ provided and they still didn't work, so I used this site:

    https://windowsreport.com/administrator-permission-delete-folder/

    I was able to change permissions to 'Everyone' and that worked.

    I can not provide a play by play, but a mix of all the solutions worked in some way. Good luck!

    Was this answer helpful?

    0 comments