Hello, I am building a new computer and what to know how to erase all the information on my current HDD, so that when I put the HDD on my new build it will be like I bought it from the store. This storage device is a 1TB HDD which currently has Win 7 home Premium installed, when I make my new build I will be installing Win 7 pro. Will installing Win 7 pro just override win 7 Home premium? If it thelps i am reusing only the HDD and GPU.