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http://blogs.msdn.com/b/rkramesh/archive/2012/01/17/how-to-add-active-directory-module-in-powershell-in-windows-7.aspx
then
import-module activedirectory
if you type get-host what version are you running?
Newer versions will import the module for you. Powershell 2 wasn't that smart.
Thanks
Mike