This version of microsoft is counterfeit? How do I fix the nagging message?

Your father is probably used to using Windows and does not want to shift to a new operating system. Any operating sytem, whether it be Windows or Ubuntu brings with it a period of learning to become familiar with its workings and, as one gets older, often changes of that nature become more difficult to accommodate.

I do not have a solution for you on circumventing this obnoxious Microsoft message nor will you find a solution at the Microsoft knowledge base.

To advocate a solution to bypass the restrictions and intrusions of Microsoft would be unethical - even though the practices such as the one that you describe are abhorrent to advocates of the free software movement.

What I can suggest, is that you persuade your father to switch to Ubuntu and offer him your promise that you will be his guide (the Ubuntu community will help you with that).

If your father is willing, save all that you can of personal files, pictures, etc., onto a USB stick, insert the Ubuntu CD into the CD player and replace XP with Ubuntu.