Ipod won't sync

I just updated Itunes on my WIndows laptop, and now I am unable sync either of my Ipods. One is a shuffle and the other a nano(I think). I see them in Itunes, but when I go to the Ipod page and click on sync, nothing happens. I tried reformatting the Ipods, but now the are empty and still don't sync. Do I have to return to an earlier version of iTunes? If so, how do I do that?

--Jack