David's friend has a computer that had Windows 10 installed, but the activation failed. He tried to activate it again, but it won't work. So he went back to Windows 7 and then had a repair shop install Windows 10 for him. Now it's asking for a serial number.
Mike bought a Dell Latitude and had to replace the hard drive. Now he doesn't have a serial number to activate it. Leo says that Dell puts a sticker on the bottom of the laptop that has the activation code on it. Mike says it wasn't there. Leo says he should contact Dell and tell them that he can't activate the machine.
The chatroom says that Dell puts the serial number in the BIOS, so that may be a place to look. There are also programs that will provide the key from the installation.