Oooh dear, that sucks. :( Just be careful where you visit, I guess. And who uses the computer. But if it's a family computer there's not much you can do there, huh. :(
I did it when I was in high school. I remember shortly before I got modded, browsing PC during one of my computer classes. lol, so much fun. No one caught me either, so that was good. :)