Song Preview in iTunes Store plays only 9 seconds

I run vista 64 bit. Lately when I preview a song in the itunes store only 9 seconds (exactly) of the preview will play. Also, when I purchase music, I am getting download errors. This has only been an issue for a few weeks. I am hoping to fix the without the hassle of completely uninstalling & reinstalling iTunes and risk loosing my iPhone data, song data etc.