If he does this while you are gone at work, I'd suggest taking your keyboard with you after powering down the computer. It won't restart w/o the keyboard. Or you could even hide your power cord to the computer. Is he computer literate? If not, unplug the case cabling to the motherboard. You could also create a 'guest' account with limited permissions for him and p/w protect your account. You didn't mention which version of IE you have and I'm not that familiar with IE 7's features.
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