HELP! need to block a site from being seen on my computer

[K]

>-----Original Message-----
>How do I block websites from being viewed on my
>computer? Not block ads or pop-ups, but make it so that
>if someone gets on the computer and tries to go to a
>specific site, it won't let them. I'm running XP home
>edition. I need to block a couple sites, so that no one
>can view them at all.
>
>Any help at all would be great, thank you
>
>.
>