Windows 7 key not valid?

i just finished my build and i bought an oem copy of windows 7, but when i type in the product key is says its not valid? please help
5 answers Last reply
More about windows valid
  1. Where did you buy this copy?
    Was the key printed on a COA and packaged with the disc?
  2. i bought it at a memory express, along with the rest of my system. i dont know what you meen by coa
  3. COA = Certificate Of Authenticity

    It's the label that has the 25 character key printed on it. The keys are specific to their particular type. For example, a retail key will not work to activate an OEM version, and vice-versa.
  4. check your zeros and Ohs, ones and Ls and any other possible typos
  5. Hi :)

    Did it come in a box ? and if so what colour ?

    All the best Brett :)
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