Are you working on a computer where webpages are being redirected? Is it not detected by anti-malware or anti-virus software?
This can be a redirect that is added to your Chrome or IE shortcuts. Right click on Chrome or IE. Go to properties. Look at the end of the command and you may see a www redirect. Simply remove the www part of the shortcut. If you have Chrome or IE pinned to your taskbar, unpin these items, correct the shortcut and repin.