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Did you install it more than once? MSDN is a one time use key only. I used a 32 bit version at first but then sold my laptop and used the 64bit with the same key but it says it was used and wouldn't let me validate it. I had to call in and do it manually and read out the string of numbers and they sent me a string of new activation code to get it validated. Just tell them you reformatted your computer and need it activated again.
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