What is your Internet Browser? I would assume it's internet explorer and someone might have installed an Add-on/plug-in on your browser without your knowledge, maybe through clicks or maybe during a visit to a malicious content website.
Try login through another Browser, like Firefox
(click here to download ) or Google Chrome
(click here to download), and see what exactly is happening. If the problem persists with the other browsers, then your system is badly infected, but if there's no problem with the other browsers, then you can try disabling the add-ons and tool bars on internet browser.
Open internet explorer, click "Tools" then click "Manage Add-ons" and disable all the toolbars and extensions. Or if you can see something that you didn't know what exactly, pick up the one you suspect and disable it. Restart internet explorer and check.
If you need further help, let me know.
Good luck.
Thanks for using
FixYa.
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