ipod touch not recognized by itunes in windows 8

Hi, I have an ipod touch. It has been working well along windows 8 all this while until 1 week ago, itunes can no longer detect the ipod touch. Funnily, when I tried connecting it other computers using Windows 7, it could be detected. I have already tried almost everything such as uninstalling and reinstalling itunes, AMDS restart. What else can I do? I really need to sync some songs into my ipod touch for a run this weekend. Please help!