window 7 academic version

What does it mean an upgrade version on Window? Can we start to install the window by itself on a new built PC?
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More about window academic version
  1. an upgrade version can only be upgraded.
    You can use it to do a clean install when you have Vista or XP on another HDD or partition.
    On a fresh build w/o a previous windows, you need either a retail or an OEM version of windows.

    Oh, and welcome to Toms Hardware
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