You will need to keep looking for more details and information.
Try Event Viewer.
Here is a link from within this Forum to help you get started:
http://www.tomshardware.com/faq/id-3128616/windows-event-viewer.html
Take your time, look around, and get a sense of how Event Viewer works.
Two notes: 1) Right-clicking any given Event will offer up more details. 2) Sometimes Event Viewer will report no data. However, it is likely still searching and will present data after a couple of minutes or so.
As for the message "Windows was not properly shut down" without any error codes, etc. the problem may be a loose connection and some component or components may be intermittently losing power.
Power off, open the case, check, and reseat, reconnect everything. Ensue that all components, cables, jumpers, chips, are all fully and firmly in place.