We have Windows XP on two laptops. Now, on one of them, when you try to log in it has an error saying Windows needs to be activated and asks if you want to do that now. Click 'Yes' and it goes to a box with a big picture of keys and says its already active and tells you to click 'OK' (only option), which sends you back to the log-in page. If you select 'No' when it asks if you want to activate Windows now, nothing happens. It's contradicting itself!

Suggestions/explanations would be most appreciated, thanks.