I found another way to see installed software from the command line (provided it’s been installed using a .msi installer).
From:
http://stackoverflow.com/questions/1482739/batch-script-to-get-specific-installed-software-along-with-version
List all installed Microsoft products:
wmic product where "Vendor like '%Microsoft%'" get Name, Version
*
List installed products that have Office in their names:
wmic product where "Name like '%Office%'" get Name, Version