Microsoft office word 2007, Product key? (10points!)?

okay so i got this computer in november (09) and i write alot, and i have Microsoft office word 2007 and when i open it, this thing pops up, for a product key.. but for the first few times i didn't enter anything.. because i don't know what a product key is.. so i closed it, and proceeded to write in... show more okay so i got this computer in november (09) and i write alot, and i have Microsoft office word 2007 and when i open it, this thing pops up, for a product key.. but for the first few times i didn't enter anything.. because i don't know what a product key is.. so i closed it, and proceeded to write in Microsoft word, and now, if i go on it, and close the product key box thingy, i cant use it at all, like i cant click on anything.. and i look at all the papers that came with the computer, and i cant find anything about a product key. So What is a product key? And where can i find mine?
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