How to Block websites in Windows XP....

There are many reasons to block websites on office computers or home computers.

This method will block websites on all your web browsers but for that you need to EDIT your HOSTS FILE.

What is HOSTS FILE ??

The hosts file is a computer file used in an operating system to map hostnames to IP addresses.
The hosts file is a plain-text file and is traditionally named hosts.

Purpose of HOSTS FILE -

The hosts file is one of several system facilities to assist in addressing network nodes in a computer network. It is a common part in a operating system's Internet Protocol (IP) implementation, and serves the function of translating human-friendly hostnames into numeric protocol addresses, called IP addresses, that identify and locate a host in an IP network.

Follow these STEPS :-->

1) Click on START --> RUN.

2) Type   C:/Windows/System32/drivers/etc/hosts and Press OK.

                        
3) Open this HOSTS file with NOTEPAD.

                                            
4) Locate the line 127.0.0.1 localhost

                                            
5) To block the website orkut.com for example, just add this text under 127.0.0.1 localhost:
          127.0.0.1 orkut.com
          127.0.0.1 www.orkut.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.

Now Orkut will be blocked in all web browser. This is an advanced but easy method to block a websites.