Your hosts file is located at
C:\WINDOWS\system32\drivers\etc
Open the file labeled hosts, open it using notepad and you'll see a log similar to this.
Code:
# 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
If you see any entry besides local host then most likely you have a hijacked hosts file unless you are running a special hosts file to keep the malware off your systems. Open the hosts file up and copy and paste the contents back here.
Another option would be to open internet options, click on the advanced tab, and click on both of the reset buttons to reset IE back to defaults.