editing the HOST file.
I don't have the details right now, XP at work, but if you get no other answers, I'll check when I get to the house.
P
Is is possible to block a website so that it will redirect to the 404 page not found screen? I thought someone on here might know if it was possible.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic