Acer Aspire Desktop had manufacturer (ACER) installed a trial Microsoft Office – V. 14 (2010) – installed in MyComputer/Acer (C:)/Program Files and also /Program Files (86). Acer Microsoft Office installation does appear in Control Panel “Uninstall a program”; Therefore there is no apparent way to uninstall Acer installed Microsoft Office and cannot be overwritten/upgraded to Microsoft Office 365 (this process tried – and still the trial takes preference – Office 365 did not install).Tried Amazon Tech Support who could not remedy the problem and transferred me to Acer Tech Support who also had any ideas how to uninstall Acer Microsoft Office installation.My tactful comments to the Acer technician were not kind – “If Acer installs any manufacture’s choices for “trial software” in a computer, Acer should know how to uninstall the software.” I will do a computer reset (to factory settings) and return to Amazon.