Top Windows 8 Security Tips
1- Know Who Used your Computer
With this trick you are able to know who used your computer in your absence. Event Viewer is a built in Windows feature also available on Windows 8, the Event Log is able to record any Login that happened on your computer with saving the Time and Date of the Login and the Session that have been
 opened. You'll also be able to reveal who tried to access your user 
account (wrong password entered). Here's the tutorial on How to see the Event Log on Windows 8. 

