Most of us  are familiar with the virus that used to block Orkut and Youtube site.If  you are curious about creating such a virus on your own, then you are  in the right place.Tody I’ll teach you how to create a simple virus that  block’s websites.And as usual I’ll use my favorite programming  language ‘C’ to  create this website blocking virus.I will give a brief introduction  about this virus before I jump into the technical jargon.
 This virus has been exclusively created in ‘C’.So,  anyone with a basic knowledge of C will be able to understand the  working of the virus.This virus need’s to be clicked only once by the  victim.Once it is clicked, it’ll block a list of websites that has been  specified in the source code.The victim will never be able to surf those  websites unless he re-install’s the operating system.This blocking is  not just confined to IE or Firefox.So once blocked, the site will not appear in any of the browser program.
 NOTE: 
 You  can also block a website manually.But, here I have created a virus that  automates all the steps involved in blocking.The manual blocking  process is described in the post.
 Here is the sourcecode of the virus.
 1. Download the source code 
 2. Compile the sourcecode using any C/C++ compiler.
 3. To test, run the compiled module. It will block the sites that is listed in the source code.
 4. Once you run the exe file, then restart your browser program.Then, type the URL of the blocked site and you’ll see the browser showing error “Page cannot displayed
 “.
 4. To remove the virus type the following the Run.
 %windir%\system32\drivers\etc
 5. There, open the file named “hosts” using the notepad.At the bottom of the opened file you’ll see something like this
 127.0.0.1—————————google.com
 6. Delete all such entries which contain the names of blocked sites.
 have a good fun...