I purchased a used laptop that has a spanish version of windows 7, home premium edition. My question is can I use this product key to install a English version of the same operating system. I plan to wipe the drive and reinstall window 7, but an English version. This laptop has a vista product key attached, so I beleive it originally had vista and was upgraded to windows 7 using a spanish windows 7 disc. Is there any way I can tell if this is a OEM product key or an upgrade product key. I would not be able to read the spanish on the screen anyway.