iTunes Sharing With Windows 7 Starter

I have 3 computers in my home. 2 run XP, 1 runs Windows 7 starter. All 3 have iTunes on them. I have sharing turned on for all of them. The 2 XP computers have no problem sharing a library. The 7 Starter netbook shows the library, but when I click on it to show the contents, it flashes on for a split second, then the shared library disappears from the menu. Any help would be appreciated.