Okay, I have a computer I want to reformat. My problem is that I don't know if I have to buy a new OS, in this case, Windows XP Home Edition. Do I have to buy a new OS from a store, or can I just use any other CD?
Wait, i have a utility called System Information. When I click on my operating system, it gives me a serial number. Do I use that number when I install the OS? I have a friend who is lending me his Windows XP Home Edition disk.