Steps

1] Browse C:\WINDOWS\system32\drivers\etc

2] Find the file named "HOSTS"

3] Open it in notepad

4] Under "127.0.0.1 localhost" Add 127.0.0.2 www.orkut.com , and that site will no longer be accessable.

5] Done!

example :

127.0.0.1 localhost

127.0.0.2 www.orkut.com-

www.orkut.com is now unaccessable

For every site after that you want to add, just add "1" to the last number in the internal ip (127.0.0.2) and then the addy like before.

ie:

127.0.0.3 www.yahoo.com

127.0.0.4 www.msn.com

127.0.0.5 www.google.com

This also works with banner sites, just find the host name of the server with the banners and do the same thing with that addy.

Hope this small tutorial could keep you going in simple way of blocking websites..