Program Compatibility Assistant - Dungeon Siege

[Missing User]

I hope i could get some assistance here with PCA with the game Dungeon Siege. I do not want to turn it of for the game. I wish to turn it on.

Why? you may ask. Well it seems i could run the game perfectly fine with this popping up before launching the game: [IMG]http://i50.tinypic.com/2wncq4y.png[/IMG]
The language you see there is in Norwegian but still you probably have seen something familiar like this with another game.

What i did i managed to turn it off and thought it wouldn't be a big deal. I chose to that it wouldn't pop up again when i started the game. But now i get a error when i try to run the game.
Yes i have tried to run the game in different compatibility modes and as administrato, and i tried to reinstall the game 3 times. But nothing helped.

So all i want now is to know how to turn PCA(Program Compatibility Assistant) pop up for the game again. If it is possible.

I would really appreciate any suggestions how to figure this out. And yeah i apologize if i have any grammar mistakes since I'm not that good in English.

EDIT: If you wonder what error it was it look like this: [IMG]http://i45.tinypic.com/s25wsp.png[/IMG]
And every time i try to close this error pop up it comes up again. And when i took a look in what kind of driver this is it is called: Protection Stub.
I dont know what the hell this is and what the problem is i have played the game perfectly fine on this computer(Windows 7). It all worked perfectly until i disabled PCA for the game.