Track My Pc

You can always track your Pc and can know what are the things that have be done on your absence,

This is a small trick which shows who operated your pc at what time and what did he did & how much long he has been using ur pc.
You can find all those information here.

First you should goto :
Click on
start-- >Then choose run-- >Now Type eventvwr.msc

Events are stored in three log files: Application, Security, and System. These logs can be reviewed and archived here only all the information of your PC in stored.
For our purposes we want the System log to be analysed. Click on "System" in the left-hand column for a list of events that is displaying.

Look for a date and time when you were not in home and your computer should have been off there you can check for the details of what has been going on in the PC.

Double click on the eg: info and it will show u the detail.

You can also use this log to see how long someone was on the computer. Just look at the time the computer was turned on and off for that day.