Block websites without any software

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 accessible.
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)

e.g

127.0.0.3 www.yahoo.com
127.0.0.4 www.msn.com
127.0.0.5 www.google.com