how do u know this stuff o.o?

How do you not know about the HOSTS file?

Common knowledge for security techs.

Another option, if you have a router, would be to log into the router, and set up a block that way. On mine, for example, if I wanted to block my parents from going to youtube, I would add a rule saying to check all HTTP traffic from 192.168.0.51 (Their machine) for *.youtube.com and send them a nice little blocked message if successful.

Edit:

This is not the best method. Not everyone has Windoze installed on their C: Drive.

A better alternative would be %windir%\system 32\....

True, but for the people who don't have it installed on their main drive should know what I mean.

C:\ is more common knowledge than global variables.

I have the same prolblem same to you. I want to know block adult sites which is not suitable for kids. Please give me correct answer for this question.

Addblock plus from firefox is amazing :D
it was on the first page of add-ons last i checked

my firefox blocks ads better than IE without add-ons already O_o

Or try a free parental control solution which lets you block sites that fall into the categories you restrict. This type of program always asks for a master password which only you know to change the settings.

If you're using Vista, it's already there in the system.

If you're using XP, u can try: http://www.k9webprotection.com/

Alternatively, any security suite should have this feature.

You could let Jesus block your porn:

http://www.afo.net/