» Tue May 15, 2012 9:02 am
I also had the problem, but the same problem is in many games.
You need to run Steam in Administrator mode. So first close it so that it is not even in the low right menu.
Then for example from start menu, move your mouse over steam and from select form right mouse button menu to run it in admin mode.
You should be able to finish installing then. Works for other games also.