I am helping a friend's son to install the game TotalWar, Rome II on a Windows 7 machine. We have the three discs retail version, but you need to use Steam to download 2 GB of files too. However, when Steam tries to download them, it hangs.
Note, the boy has been using Steam for several weeks, for several games, without any issue.
Since his friends are able to install it on their machines, I suspect it is a local problem, maybe some permission issue, but I am not familiar with Windows 7 and I am not able to guess which one it could be.