Installation error after PC rebooted

After my PC was rebooted I faced the following message (Check the attachment). The dialogue box’s title is ‘Isass.exe Application Error’. It bears the message –
The instruction at ‘0xoo401082’ referenced memory at ‘0x00000000’. This memory could not be ‘written’.”
Please have a look at the screenshot attached.
If you have any ideas please let me know what can be done.

System Shutdown
This system is shutting down. Please save all work in progress and log off. Any unsaved changes will be lost. This shutdown was initiated by NT AUTHORITYSYSTEM
Message
'C:WINDOWSsystem32Isass.exe'
terminated unexpectedly with status code
-1073741819. The system will now shut down and restart.
