1] Run Windows Update
Since the source of this fltmgr.sys file is Microsoft; you might want to run Windows Update and see if it resolves the issue.
2] Run sfc/scannow
After that, type in the following command,
And then hit Enter.
3] Run Blue Screen Troubleshooter
4] Checking hardware for physical issues
You may also want to run ChkDsk. You could run a command like the following to check and repair disk errors on your C drive:
chkdsk c: /f /r