How to Block a Website in All Web Browsers

Steps

In Windows XP

1. Click Start->All Programs->Accessories->Command Prompt.
2. 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.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".