I am uncertain as to what you mean by XPs display properties. I enabled the second monitor with a right click on the background, clicking Settings, and using the settings there. Both monitors work fine. The problem is what I call a phantom display area. Windows pop up off screen and I cannot see them. The item is in the task bar a the bottom of the screen but not visible. The cursor will move off screen and seems to keep on going, but I cannot tell how far.
If MS Word pops up off screen, I can right click its icon on the task bar, then click Move, then without moving the mouse, left click. That seems to grab the Word window and I can drag it to the right and it appears. But when I do a Find from within Word, the Find window does not have an entry on the task bar so I cannot grab it. Some times I can type blind and get what I want, but other times I cannot use the find box.
Does all that get us any closer?