window 7 academic version

[nanmeit]

What does it mean an upgrade version on Window? Can we start to install the window by itself on a new built PC?

 

[arges86]

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