When you try to install the 64-bit version of a Microsoft Office 2010 suite or the 64-bit version of a Microsoft Office 2010 product, you receive the following error message at the beginning of the installation process:
You cannot install the 64-bit version of Office 2010 because you have 32-bit Office products installed. These 32-bit products are not supported with 64-bit installations:
If you want to install 64-bit Office 2010, you must uninstall all 32-bit Office products first, and then run setup.exe in the x64 folder. If you want to install 32-bit Office 2010, close this Setup program, and then either go to the x86 folder at the root of your CD or DVD and run setup.exe, or get the 32-bit Office 2010 from the same place you purchased 64-bit Office 2010.
The placeholder <products> represents any version of Microsoft Office and also any component that you downloaded separately from the Microsoft Download Center that applies to Microsoft Office. See the "More Information" section for a list of these products.
The 64-bit version of Office 2010 is incompatible with the 32-bit version of Office 2010 products or with the 32-bit version of Office 2010 components that are listed in the "More Information" section.
Additionally, you cannot install 64-bit versions of Office 2010 products and 32-bit versions of Office 2010 products on the same computer. For example, if you install the 32-bit version of Microsoft Office Professional 2010 and then try to install the 64-bit version of Microsoft Project Professional 2010, you receive the error message that is mentioned in the "Symptoms" section.
To install the 64-bit version of Office 2010, you must uninstall the products that are listed in the error message. Note the products that are listed in the error message, and then follow these steps for your version of Windows. (The product names that appear in the error message are the same product names that appear in the Programs Control Panel that you will use to uninstall them.)
To remove an earlier version of Office, click one of the following article numbers to view the article in the Microsoft Knowledge Base.
290301 How to uninstall or remove Microsoft Office 2010 suites
928218 How to uninstall or remove Microsoft Office 2007 suites
2639197 How to uninstall or remove Microsoft Office 2003 suites
You can also use the following instructions to remove a single component.
Windows Vista or Windows 7
While the error message is displayed on your screen, note the names of the products that are listed.
Click Start, and then click Control Panel.
Under Programs, click Uninstall a Program.
Locate one of the products that you noted in step 1, right-click the product name, and then select Uninstall.
Repeat step 3 until you have uninstalled all the products that you noted in step 1.
After you remove all previous 32-bit versions, you can try to install the 64-bit version of Office 2010.
Known issues with this resolution
Restart of your computer is requested during Uninstall
You may receive a message to restart your computer, depending on the product that you are uninstalling. When this message is displayed, you must restart the computer to finish the uninstallation process. If you do not restart your computer, you may receive different error messages when you try to install Office later.
Application compatibility and the 64-bit version of Office
We strongly recommend that customers use the 32-bit version of Office 2010 even on 64-bit versions of Windows because of application compatibility. If you have add-ins on your computer, especially if you sync your mobile phone together with Microsoft Outlook, check with the add-in manufacturer to see whether a 64-bit version of the add-in is available before you install the 64-bit version of Office 2010.
For more information about the differences between the 32-bit and 64-bit versions of Office 2010, visit the following websites:
Microsoft does provide 32-bit and 64-bit versions of the following components for Office 2010. You can install the 64-bit versions of these components to work with the 64-bit version of Office 2010.
Microsoft Access Database Engine 2010
Microsoft Access Runtime 2010
The following list includes those products that may be displayed in the error message and that must be removed in order to install the 64-bit version of Office 2010.
Microsoft Office 2010 products and components
32-bit versions of Microsoft Office 2010 suites
Microsoft Office Home and Business 2010
Microsoft Office Home and Student 2010
Microsoft Office Standard 2010
Microsoft Office Small Business Basics 2010
Microsoft Office Professional 2010
Microsoft Office Professional Plus 2010
32-bit versions of Microsoft Office 2010 individual products
Microsoft Access 2010
Microsoft Excel 2010
Microsoft Office Groove 2010
Microsoft InfoPath 2010
Microsoft OneNote 2010
Microsoft Outlook 2010
Microsoft PowerPoint 2010
Microsoft Project Standard 2010
Microsoft Project Professional 2010
Microsoft Publisher 2010
Microsoft SharePoint Designer 2010
Microsoft Visio Standard 2010
Microsoft Visio Professional 2010
Microsoft Visio Premium 2010
Note: Microsoft Office Groove 2010 may be displayed in the error message but is not listed among the programs in Control Panel. You must uninstall Microsoft SharePoint Workspace 2010 in Control Panel to remove Microsoft Office Groove 2010 from the error message.
32-bit versions of Microsoft Office 2010 components
Microsoft Access Runtime 2010
Microsoft Access Database Engine 2010
2007 Microsoft Office products and components
2007 Microsoft Office suites
Microsoft Office Enterprise 2007
Microsoft Office Home and Student 2007
Microsoft Office Standard 2007
Microsoft Office Professional 2007
Microsoft Office Professional Plus 2007
Microsoft Office Small Business 2007
Microsoft Office Ultimate 2007
Microsoft Office Basic 2007
2007 Microsoft Office individual products
Microsoft Office Access 2007
Microsoft Office Excel 2007
Microsoft Office Groove 2007
Microsoft Office InfoPath 2007
Microsoft Office InterConnect 2007
Microsoft Office OneNote 2007
Microsoft Office Outlook 2007
Microsoft Office PowerPoint 2007
Microsoft Office Publisher 2007
Microsoft Office Project Standard 2007
Microsoft Office Project Professional 2007
Microsoft Office SharePoint Designer 2007
Microsoft Office Visio Professional 2007
Microsoft Office Word 2007
2007 Microsoft Office components
Compatibility Pack for the 2007 Office System
Microsoft Office Access Database Engine 2007
Microsoft Excel Viewer
Microsoft PowerPoint Viewer
Microsoft Office Proofing Kit 2007
Note: The Microsoft Office Access Database Engine 2007 is installed by the 2007 Office System Drivers: Data Connectivity Components download.
Microsoft Office 2003 products and components
Microsoft Office 2003 suites
Microsoft Office Professional Edition 2003
Microsoft Office Professional Enterprise Edition 2003