Whilst I don't require help for this game, I thought I would let anyone that has the game or is getting it and has Vista of course that if you have errors on install all the way through it, don't panic, you must for this game go to My Computer, right click the drive the disk is in, then click open and browse to the Autorun icon, then right click it, and choose run as administrator, this is the only way this game installs at least for me.
I have seen alot of threads around the net about this and you must do it the way I have said above, doing it the usual way takes, well, if you left it for a couple of months, I'd bet that when you returned it would still be trying to install.
I wasted an hour and a half and each time the error appeared, usually error reading and then a map ie Isengard, it asked me if I wanted to retry, I clicked retry and the install continued, but the errors kept coming for every map, in the end the install seemed to get stuck and just sat there.
But I thought that if anyone has the game and is stuck then please do the above, worked a treat, still took about 20 minutes to install but all was well and no errors.
Hope this may help others with install problems
Jeykll and Hyde