I just bought a Dell Latitude E6400. It came with a genuine version of Windows 7 pro 32. I pulled the activation key (used 2 separate programs to make sure) and re-installed to a 64x version of windows 7 pro. The key did not work, it was <Redacted. Do NOT post keys here>, I say this on the internet without worry because I found out that is just some general Dell key. I looked under the battery and found a COA sticker, but it is for Vista (and does not work for 7, and I have not verified it works for Vista). What should I do, contact the guy I bought it from? Contact Dell? If nothing else, do they still sell those $40 upgrade cds?