How can I see if someone else is using my computer? How do I lock my computer?

I have a computer that might not be as private as I thought so I would like to see if it has been turned on while I'm gone. Is there a log I view showing time and date my computer was turned on? Also, what is the best way to lock down my computer? I am using Win XP and have 4 usb ports which I understand... hiển thị thêm I have a computer that might not be as private as I thought so I would like to see if it has been turned on while I'm gone. Is there a log I view showing time and date my computer was turned on?

Also, what is the best way to lock down my computer? I am using Win XP and have 4 usb ports which I understand make the machine vulnerable.

I hope there is a way to totally stop access to the machine as the computer expert in the family will take it as a challenge to get in.

thanks for the hepl!
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