how to block a particular website in any browser?

In Windows XP

1. Click Start->run
2. type cmd
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 rhino.acme.com # source server
# 39.6.0. 1 x.acme.com # x client host

127.0.0.1 localhost
127.0.0.1 update.bitdefender.com (change this name by name of site u want to block)
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.