Most of the time a malware modifies Windows hosts file to prevent users from gaining access to Security related websites. Below is a guide to clean your Windows Hosts File.

1. Navigate to the following location:

Windows 95/98/Me:
%Windir%
Windows NT/2000/XP:
%Windir%\System32\drivers\etc
Windows Vista:
%Windir%\System32\drivers\etc

2. Double-click the hosts file.
3. If necessary, deselect the “Always use this program to open this program” check box.
4. Scroll through the list of programs and double-click Notepad.
5. When the file opens, delete all the entries added by the risk. See sample of a clean hosts file content below.
6. Close Notepad and it should be save automatically (without a file extension).

- - - - Below this line is an example of Clean Windows Hosts File - - - - 

# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a ‘#’ symbol.
#
# For example:
#
#      102.54.94.97     rhino.acme.com          # source server
#       38.25.63.10     x.acme.com              # x client host

127.0.0.1       localhost

- - - - Above this line is an example of Clean Windows Hosts File - - - -