I got a MacBook with Microsoft Office 2008. When I try to install it on my wife´s Mac it warns me "the license is only for one machine". I uninstalled it and tried with a new Office 2008 software with new serial but when I try to do so, it always says that the serial number is the previous one, so the machine kept the original serial number and does not let me install the new office. I tried almos everything, unsuccessfullly. How to install a new Office 2008 serial? How do I uninstall completely the previous version?