001 Windows7 ATV home sharing issue

I had been having the same issue as everyone else - I had access to everything except the home library. Windows 7 iTunes 11 would not talk to ATV. After toying with Norton (not the problem), ATV3 (not the problem), iTunes (not the problem), reset the network drives, reset the broadband, checked the switches and cables, I went into Windows 7 network settings and deselected IP6 (keep IP4).

Bingo!