This article explains how to remove system file protection from hosts file on your computer. This may be required after a virus has infected a computer.
Browse to the hosts file (C:\windows\system32\drivers\etc)
Right click on the hosts file, go into Security and Take Ownership
Re-open the security options and grant administrators Full Control
Open a command prompt and change to the location of the hosts file (cd/dC:\windows\system32\drivers\etc)
Type the following command into the command prompt to enable the hosts file to be edited again attrib-r-a-h-s hosts
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