Block websites without any software
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.