I ordered a Windows 7 Home Premium 32bit os online and just received a DVD & Key Code sticker. The DVD label shows it to be a reinstallation DVD, Windows 7 Home Premium 32-bit Dell branded and states that the DVD is only to be used to reinstall the OS on a Dell PC. I built this PC & it previously has had XP Pro installed for the last several years. A couple of weeks ago I had a problem with some Malware & made the mistake of attempting to reinstall the XP Pro only to find out that MS has locked out my key, the same one I have been using on this built PC for the last 3 years. The previous PC was built by a local PC builder & I just reinstalled the OS on the new system. Should I send this Win7 DVD back to where I bought it, or can I use it? What a mess, Thanks DWB