what to do

Some cases have a hole for a padlock to stop people getting inside? Does yours?

If not, take your HDD with you.
 
how he manages it i do not know ???, once took a gfx card out of a computer still running

Um, there's your answer right there, the guy is a computer clutz. Does he think he's a computer buff maybe? I wouldn't let him watch a kettle boil never mind a house :p
Password protect bios, disable boot devices to only HDD, give him a standard user account, unplug the interwebs. And cross your fingers ;)

Why does he need to use your computer anyways? Just put the router in the loft and tell him you have no internet connection.
 
right...i spoke with his las night, ive told him to bring his computer round as i dont want him to break mine, he said he was bringing his anyway and knew i wouldnt want him using mine.
happy days
 
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