morris1114, Thank you for using the Dell Community Forum. You only have a license to install Windows 7 on 1 computer. Installing on 2 systems is not pemitted. You do  not have to do anything to the HD prior to returning it to Dell.
hello, i've just got a 2 questions that i'm not too sure the answer for. i've got a windows 7 upgrade for one of my dell laptops in my house, can i upgrade both of my laptops and not be violating anything? and also i had to repalce the HDD in my laptop that was already upgraded, dell sent me out a new on and it installed vista, then i upgraded to 7 and punched in the product key. my question is do i have to do anything with the old HDD before i send it back to dell since it still has windows 7 and my product key on it?
2 quick questions