Need to change the product key that office 2013 was installed with?

Open a command prompt

And type the following (This is for 32bit office on 64 bit windows)

cscript “C:\Program Files (x86)\Microsoft Office\Office15\OSPP.VBS” /dstatus

Last 5 characters of installed product key: JHRTJ

cscript “C:\Program Files (x86)\Microsoft Office\Office15\OSPP.VBS” /unpkey:JHRTJ

—Processing————————–
—————————————
Uninstalling product key for: Office 15, OfficeO365HomePremR_SubTrial5 edition
<Product key uninstall successful>
—————————————
—Exiting—————————–

Next time you open up a office product it will ask for you a accounts or you can click to enter a CD key.