Windows 10 support center
If it shows blue screen with code APC_INDEX_MISMATCH on Windows 10,try following steps to fix the problem.
1.  Go to “Settings”-”Update & Security”
2.  Click on “Resume updates” or “Check for updates”,it depends whether updates are on pause.
3.  Wait till it find updates.Due to different version of system,either one of following patches can be updated.

KB5001565

KB5001566

KB5001567

KB5001568

4.  Wait till update is downloaded and installed,then restart computer immediatel