Sometimes you will suspected others ever using your computer but without any proof.
Actually in Window 2000 or xp,the system will record down the time as you start up and turn off the computer. Here i showed you how to find out this information.
Step1 :start ->my computer ->manage,
Step 2 :computer management window will pop up,select the ‘system tool’ ->’event viewer’ ->’system’.
Step 3 :At the right side in event column,find the figure ‘6006’,this ‘6006’is the event log as you turn off the computer,you can compare the time that show in event log then you know your computer has turn on before or not.