The fslx.sys driver cannot start. To confirm that fslx.sys is not started open a command prompt as administrator and run:
sc query fslx
The following command normally starts fslx.sys:
sc start fslx
However if the system is missing a specific patch (KB3033929) this message will appear:
[SC] StartService FAILED 577: Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.