Problems With D2nt How Do I Fix My USB Problems With Vista?

How do I fix my USB problems with Vista? - problems with d2nt

I'm using Vista on this computer for 2 years without problems, but recently, my USB ports no longer work with everything that is associated, in addition to my keyboard and mouse, I have done things differently, I gave one days after, trying to connect my MP3 player and it would not work, my computer detects that a connected simply not for some reason ..... please someone help me?