I have a computer that no longer has windows on it, it still should have a valid product key for that copy of windows. The Product key under the comp is worn down, and im barely able to make out 22 of the 25 numbers/letters. I also have the bar-code number on the COA sticker if that would help get this thing reinstalled. There is no recovery partition as the entire drive was reformatted.all i have is an old worn out COA sticker. I also have a copy of the same version of windows on CD, which is being used on my current computer, and not my older computer so media should not be needed for a reinstall, I just want to use the genuine product key for that computer if i do install windows on it again. I have seen some answers here and there, but id like Microsoft to tell me what they can do about my old COA sticker of windows, since it is their product. I understand that not having the OS installed current is a problem sometimes, however things happen, and its the COA sticker that has failed me most in this case so far.