How can I activate Windows without the activation key?

Episode 1054 (13:49)

Mike from Glendale, CA

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.