Installed On Your Computer
Click-to-Run is the technology used to install Office 365 subscription and most versions of Office 2013 and newer. Windows Installer technology (MSI) was used to install the volume license editions of older versions of Office 2016 and older, such as Microsoft Office Professional Plus and Microsoft Office Standard.
You can't install the same version of Office products that use two different installation technologies installed on the same computer. This also applies to standalone applications like Access, Visio, Project, Skype for Business, or OneDrive for Business.
View Programs Installed On Your Computer
You'll get the following error message if Office detects this incompatibility:
Note: In some cases, you also can't have two different versions of Click-to-Run applications on the same computer. For more information, see 'Stop, you should wait to install Office 2016' error.
Dell Already Installed On Your Computer
Mar 6, 2007 - How do I find out what's installed on my machine? Add/Remove Programs. Fire up Windows Control Panel, and click on Add or Remove Programs. All Programs. Click your Start menu, and then click on All Programs. C: Program Files. Another good location to examine is the folder on your Windows Drive where most programs are.