There are many ways to block a certain website and the simplest way is to configure your browser’s settings to disallow browsing to a specific site. Some reasons might be to prevent your children from having access to a certain website.

Block Website in Internet Explorer

1. Open Internet Explorer
2. Go to Tools > Internet Options
3. Click the Privacy Tab.

4. Click on Sites Button there and once it opens type the address of the website and click Block.

5. And you are done.:)

Block Websites in Other Browsers in Windows Xp

1. Click Start->All Programs->Accessories->Command Prompt2. Click Command Prompt.
2. Once Command prompt Opens, type notepad C:/Windows/System32/drivers/etc/hosts
3. Locate the line 127.0.0.1 localhost
4.To block the website myspace.com or any other website for example, just add this text under 127.0.0.1 localhost:

127.0.0.1 myspace.com
127.0.0.1 www.myspace.com

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

5. Save the File now and you are done.