IF you guys are having problems downloading it directly from MS, try

http://vistatorrent.com

"The only official tracker for this torrent is found here at VistaTorrent.com. We're providing an MD5 hash to verify the file after download to make sure you're getting the real thing. If the torrent URL is anything other than the one from Vistatorrent.com, don't download or install the file! We're staking our reputations on providing a clean ISO torrent here. There is no registration required to download this torrent."

simple.