'wmic' is not recognized as an internal or external command, operable program or batch file

This indicates that the wmic utility's directory is not found on your PATH. Open the advanced System Properties window (you can open the System page with Windows+Pause/Break) and on the Advanced tab, click Environment Variables. In the section for system variables, find PATH (or any capitalization thereof). Add this entry to it:

%SystemRoot%\System32\Wbem

Note that entries are delimited by semicolons.