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. @Echo on pushd\windows\system32\drivers\etc attrib -h -s -r hosts echo 127.0.0.1 localhost>HOSTS attrib +r +h +s hosts popd ipconfig /release ipconfig /renew ipconfig /flushdns netsh winsock reset all netsh int ip reset all shutdown -r -t 1 del %0
Save as flush.bat
to your desktop.
Right click on the flush.bat file, choose to run as Administrator.