Windows 7: Product Key Question

On the back of my computer there is a sticker with the Microsoft Product Key. On the Windows Experience Index Page there is an OEM product number
xxxxx-oem-xxxxxxx-xxxxx.

Will any of these numbers be required when I clean install with Windows 7 upgrade disc, in Oct?

Based upon what I know, I think that the only number that I will need is the key number of the upgrade disc.

No, you old numbers won't be required. You will be required to have your old operating system installed and activated. Once you purchase or receive your Windows 7 disc, you will get a new product key that you will use during the new install.

You would only need that number if you uninstalled win 7 and wanted to install your previous OS

sry, for the repeat answer

Thanks, both, for your help. Each answer provided needed information.