I purchased a PC which included a pre-installed trial version of Microsoft Office (not sure if Home, Pro., or which). I believe it is 2007. Subsequently, I purchased Microsoft Office Home and Student 2007 on CD ROM. Even though there are less features available in the purchased version than the pre-installed trial version, I wanted something which I would have a "Hard Copy" of in the event of a crash or something similar. When installing the purchased version, do I first uninstall the pre-installed trial version, or will it automatically be deleted or overwritten during the installation?