Here's my aggravation. This evening I installed WC3 KS version and I have Windows XP. The game ran pretty much flawlessly and the only trouble was a slighty laggy keyboard input during flight. So I came on to these forums to find a fix, and used the Microsoft Compatability Tool Kit I found on the thread "WC3 KS Version fix on XP".
And after a while dinking around with that program, I tried running WC3 from it and all of the sudden it would freeze at the intro. This had not been happening before at all. I deleted and reinstalled everything but I'm still having the problem. I tried deleting the Microsoft program but that did nothing (although it won't allow me to completely delete it).
So I came here and read through the posts earlier about people who had the same problem with the intro freezing. And I've applied the Win2000 patch and set the game to 2000 compatability. Nothing. I've set the game to 95 and 98 compatability, no dice. I've alt tabbed to set the game to Normal priority and found that it already -was- at normal priority, so I set it to all the other priorities. Nothing!
So now I'm really in a mysterious pickle. It was running perfectly well a few hours ago. I played up until the fourth mission without a hitch. And now I can't get past the intro. I really, really need some help here.