How to know who Used your Pc in your
absense...... and what did he/she Did.
just follow the below steps .Steps :start > run >eventvwr.msc
Events are stored in three log files: Application, Security, and System.
These logs can be reviewed and archived.
For our purposes we want the System log. Click on "System" in the left-hand column for a list of events.
Look for a date and time...