How to Block a website without any tool in a PC :

1) Go to "My Computer"
2) In "C drive" go to the following path :
        C:\WINDOWS\system32\drivers\etc
3) In "etc" folder a file named "hosts" is there.
4) Open the file with notepad and write the following.
          #block
          127.0.0.15      www.anyname.com