I was using Vista SP2 64x and had problems copying large files across the network and also downloading large files from the internet. Would always hang up soon into the downloads/copy. Tried many posted fixes for the problem but nothing would work. I couldn't even backup the machine to my Windows Home Server because of the network issue. Installed Windows 7 7100 64X in a dual boot on the same hardware, same network connections and it worked great without any problems. I checked the network drivers
and both Windows 7 and VistaSP2 were using the exact same driver
but Vista would still hang and Windows 7 would work. I removed Vista and have gone to Windows 7 and now my WHS can backup by machine without any problems and all my network issues are a thing of the past. I have no idea what they have done with the networking but I do know that it corrected the problem I had and I will not look back towards Vista land.