I have a ASUS Eee PC 1016P 10.1" Netbook and it has windows 7 already preinstalled. Whenever i try to use something like microsoft powerpoint or microsoft word it tells me to enter the product key. Why does it keep doing this? I pretty sure i don't have the trial version because i used it over sixty days before and used it more than 25 times. My computer was experiencing some problems and they are fixed now but i can no longer use microsoft programs without it asking me for product key. it never used to do this until i had to do system restore which set my computer to factory condition like i just bought it. do i have to buy the program to get product key?