Remove computer access from him totally (by location controls or shutting off the power, or whatever) and make him walk his ass to town to use the library to look at the internet.
Not only will it keep your PC safe, it'll give him some excersise.
Job done.
__________________
╔═════════════════════════════════════════╗
Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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