The version I bought is a dell oem version of windows 7. I had some reluctance to buy such a version for my computer mounted piece by piece (boneless) in the eyes of the reviews I'd seen everywhere on the Internet. I got even more than the cd that I received was a resettlement cd with a license sticker which seemed a little dated and had already served ... After contact with the seller assured me that 'there was no problem. So I installed this version on my computer, windows then told me that my version might be hacked and asked me my license key which I then informed. Windows then asked me to activate my license either by internet or by phone, I then chose the telephone option. The telephone server is really well done and perfectly explains the procedure. Briefly, activation of the highly successful license with a small message windows telling me that I had a perfectly accepted and activated license. So no problem to install a dell oem on a computer of another brand (see unmarked at all).