“Office (64-bit) couldn’t be installed” error when you install Office

You'll get this error message if you try to install the 64-bit version of Office 2013, Office 2016, Office 365, or an Office stand-alone application like Visio on a computer that already has a 32-bit version of Office.

Can't install 32-bit Office over 64-bit Office error message

Note: The preceding dialog box says that Office (64-bit) couldn't be installed because 32-bit Office programs are installed. There's a corresponding dialog box that says that Office (32-bit) couldn't be installed if you have 64-bit Office programs installed.

You'll get this error message if you try to install the 32-bit version of Office 2013, Office 2016, Office 365, or an Office stand-alone application like Visio on a computer that already has a 64-bit version of Office.

Can't install 32-bit over 64-bit Office error message

You can’t mix 32-bit and 64-bit versions of Office.

When it comes to 32-bit and 64-bit versions of Office, you have to choose one or the other—installing a combination won’t work. You can mix versions like Office 2010 and Office 2013 or Office 2016 – as long as both are 32-bit or 64-bit.

So, if you’re installing Office 2013 or Office 2016 alongside another version of Office, install the type that matches what you already have. For example, if you already have the 32-bit version of Office 2010 installed, install the 32-bit version of Office 2013 or Office 2016.

If you want to switch from 32-bit to 64-bit, you’ll have to uninstall the 32-bit version and then install the 64-bit version. Likewise, if you want to switch from 64-bit to 32-bit, you’ll need to uninstall the 64-bit version and then install the 32-bit version.

For example, if you have the 32-bit version of Office 2010 and you want to install the 64-bit version of Office 2013 or Office 2016 and keep Office 2010 on the same computer, you’ll need to uninstall Office 2010, re-install the 64-bit version of Office 2010, and then install the 64-bit version of Office 2013 or Office 2016.

To help you decide which version to install, see Choose the 32-bit or 64-bit version of Office.

Uninstall Office

Use the appropriate uninstall instructions for the version of Office you want to uninstall.

Install Office

Note: If you want to have only Office 2013 or Office 2016 on your computer, you don’t need to reinstall the other version you uninstalled in the previous section.

To reinstall Office 2010 or Office 2007, use your original Office DVD and product key.

To install the 32-bit or 64-bit version of Office 2013 or Office 2016   

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