Has someone been snooping around your PC without your knowledge. If your computer contains some confidential or private data. A password is a good option. However, if someone has been granted access to your PC or you don’t have a password, you might need to see if someone accessed your PC. In that case, you can simply keep a check on the use of computer in your absence. Here are the steps to follow:
Step 1: Type “eventvwr.msc” in “Run” under “Start’
Step2: Now, on the left side, you will see “system”. Click on it.
Step3: Now just search for the date and time when your computer according to you should be off.
Step4: Now click two times on the event that has occurred during the off time and all the details will be displayed.
Step5: Also, the time period for which the computer was used can also be noted down.
Has Someone Secretly Used Your Pc In Your Absence?
Reference : http://pctipstrickshacks.com