1. Click Start->All Programs->Accessories->Command Prompt2. Click Command Prompt This will open a DOS command window.
3. Type: notepad C:/Windows/System32/drivers/etc/hosts
4. Locate the line 127.0.0.1 localhost
5. To block the website google.com for example, just add this text under 127.0.0.1 localhost:

127.0.0.1 google.com
127.0.0.1 www.google.com

You can add as many sites any site, However you will need to prefix it with "127.0.0.1".

6. Save the file
Google will now be blocked in all web browser. This is an advanced but easy method on how to blow a website.