Most of the people playing Warcraft / Frozen Throne / Dota confront this problem when they install windows 7. The game doesn’t run on full screen and there are black areas on both sides. There are lots of forums already discussing this issue and since I was having trouble as well, I was subscribed to some of them myself. But never found a solution, untill now!
I found a utility (13KB only) that widen’s warcraft / Dota in a second. Just download, run, press OK and enjoy warcraft in full screen (Widened – better graphics) mode.