“I bought the upgrade to Windows XP. I installed it on my computer and on my husband's computer (keeping in mind that they are ours), and they are both in our home for our personal use. I have now been told my Microsoft that we cannot register the one on his computer because I have already registered it on mine, and that we need to buy ANOTHER one for his computer. Have I done something wrong? Can this possibly be true?” [Yeah, that's the way they're doing it from now on. One activated OS per machine. Reportedly, you can go through Microsoft and get a discounted license for your second machine, but I have yet to find the official page which provides the details. That's about all you CAN do. If you don't like the situation, don't use the operating system.]