HI, I am a noob here, so if this does not get posted or replied please let me know what I can do to get an answer to my question. So here it is. I have installed Windows XP Pro into my friend's computer, they did not know the product key and I couldn't find the product key on the puter until today. The 30 days is up and now the Activate window comes up after logging in. Guess what?, the product key is for Home Edition. Now, my friend has put files and pictures on the computer and they are not backed up and of course does not want to lose them. My tech buddy is lending me the install disc for WinXP Home Edition. here is the question: Can I install Windows XP Home Edition from Pro without having to format the drive? So that I may not lose any files or data. Assistance is always appreciated.