You were tricked. In other words, "hijacked" and you are now infected with malware.
Flush your DNS cache and restore the original Hosts file:
Copy and paste these lines in Note pad.
attrib -h -s -r hosts
echo 127.0.0.1 localhost>HOSTS
attrib +r +h +s hosts
netsh winsock reset all
netsh int ip reset all
shutdown -r -t 1
Save as flush.bat to your desktop.
Right click on the flush.bat file, choose to run as Administrator.