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Windows 7 denying my activation code
So recently, I did a clean install of Windows 7 Home Premium 64-bit, and it has been just wonderful. But, just a few minutes ago, note that I did the install 2 weeks ago, it said my activation code for windows 7 home premium 64-bit is wrong. Now, the thing I have a problem with is that, I used the code that came with my computer. I bought the Dell XPS studio 7100 and it came with it, The activation is right above the service tag, and at first is registered fine, but now it is denying it.
What is wrong? How do I fix this? HELP