Qvdntlmw Toolbar is yet another variant of the infamous Zlob Toolbar. It has been a while since a new version of this toolbar has been released, but there was a flood of them a few months back and all of them have equally unintelligible names and  the exact same functions. Qvdntlmw Toolbar’s only purpose is to promote rogue anti-spyware programs. It does so by redirecting the browser to various unsolicited rogue websites, displaying popups and fake system notifications to inform the user that he is "infected", and having buttons linking to rogue websites. None of the software or services promoted by Qvdntlmw Toolbar are to be trusted and it itself should be removed upon detection.

Source: http://www.2-viruses.com/remove-qvdntlmw-toolbar