Do you have your PC displaying on this screen now?
From what you are saying it sounds like you are currently able to view your computer screen in some mode on your display but you want to add touch to it?
I am assuming you are asking if you can put another touch screen on top of the one already there?
Should be doable but might make it harder to make your original screen to work since you are placing another level of plastic on top of it.
If it is capacitive I don't think there is an issue.