Windows 8 computers can't see Windows 7 computer on network

I'll be goddamned if Microsoft still hasn't got their shit together with getting network sharing to work without having to bend over backwards. I have a Windows 7 computer that can't be seen on the network by either of 2 computers running Windows 8. Network discovery is on on all 3 computers. All 3 computers can connect via HomeGroup. I've tried accessing the Windows 7 computer via...