Why do incompatible drivers prevent using Memory integrity?

[News]

Find out what steps you can take if an incompatible driver in preventing you from turning on the Memory integrity setting in Windows Security.

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[Peterr]

Neither MS nor the manufacturer has the drivers for these external drives, They are about 12 years old and I don't have the name only the serial #.
I updated SES and both WD Books. I also downloaded what I think was a legacy driver. Nothing worked and it prevents core isolation from working.
Is my best bet to transfer the material to new drives and get core isolation to work that way?

 

[Peterr]

The task of device security/core isolation not working has changed because I removed the two old WD external drives and installed another external drive. However the same wdcsam64_prewin8.sys message when trying to open device security/core isolation persists. It seems the incompatible drivers from the previous drives is in the registry or something like that. At my level I cannot diagnose how to turn this feature on.

 

[Peterr]

Device manager > view to hidden drives then remove the offender. Throw outdated drives away.