How to Block a Website in All Web Browsers, For windows

STEP 1 : Open Windows Start menu and type in search box C:/Windows/System32/drivers/etc. If Windows isn't installed on the C: drive, Change the C: for the appropriate drive letter.

STEP 2 : Copy hosts file and past it on desktop.

STEP 3 : Now open hosts file inside notpad or notpad++

STEP 4 : Goto end of the page and Blocked URLs as you want.
        
         Example :
         # Blocked URLs
           127.0.0.1       websitename.com

STEP 5 : Save and close the hosts file.

STEP 6 : copy this edited file and past this location (C:/Windows/System32/drivers/)