Error 1935 when you try to install Microsoft Office 2010 or 2007

If you see "Error 1935. An error occurred during the installation of assembly component" when you install Office 2010 or 2007 or one of the Office stand-alone products like Excel, restart the computer and try to run setup again as a quick first step.

If the error still appears after restarting the computer, try these other methods to fix the problem:

Run the System Update Readiness tool

IMPORTANT The System Update Readiness tool can only be used on Windows 7 or Windows Vista operating systems. If you have Windows XP, try one of the other methods in this article.

Select and download the System Update Readiness tool for your version of Windows:

• Download for the 32-bit version of Windows 7
• Download for the 64-bit version of Windows 7
• Download for the 32-bit version of Windows Vista
• Download for the 64-bit version of Windows Vista

For more information about the System Update Readiness tool and links to download versions for Windows Server operating systems, read What is the System Update Readiness Tool?

Repair or update Microsoft .NET Framework components

First, check installed programs to see if the latest version of .NET Framework is installed. To do this, follow these steps:

1. Click Start (or Start > Run in Windows XP).
2. Type appwiz.cpl, and then press Enter.
3. Look for Microsoft .NET Framework 4 Client Profile in the list of installed programs. See image.

If you find Microsoft .NET Framework 4 Client Profile, follow these steps to repair it:

1. Close all applications.
2. Click Start (or Start > Run in Windows XP).
3. Type appwiz.cpl, and then press Enter.
4. Click Microsoft .NET Framework 4 Client Profile and click Uninstall/Change (or Change/Remove in Windows XP). See image.
5. Choose the option to Repair .NET Framework 4 Client Profile to its original state, and then click Next. See image.
6. When the repair is complete, click Finish, and then click Restart Now to restart the computer.

If you can't find Microsoft .NET Framework 4 Client Profile, download and install it to update the computer. You can download the file from:

Microsoft .NET Framework 4 (Web Installer)
Try to install Microsoft Office again. If error 1935 continues to occur, follow the steps to uninstall and reinstall .NET Framework from the computer.

Uninstall and reinstall Microsoft .NET Framework components

IMPORTANT The .NET Framework Setup Cleanup Utility provided here should only be used only after you've tried the previous options.

To uninstall .NET Framework components from the computer follow these steps:

1. Create a temporary folder on your desktop.
2. Visit the .NET Framework Cleanup Tool User's Guide blog and download the dotnetfx_cleanup_tool.zip file.
3. When prompted, click Open, and then click Extract Now. Extract the files to the folder you created.
4. Find cleanup_tool.exe in the folder you created and double-click it.
5. In the "Do you want to run the .NET Framework Setup Cleanup Utility?" message, click Yes.
6. Click Yes to accept the license agreement.
7. In the Product to cleanup window, choose a .NET Framework version that you want to remove.
   
   Note You can't remove .NET Framework versions that are part of the Windows operating system. If you have Windows 7, you can't remove .NET Framework versions 3.5 or lower. If you have Windows Vista, you can't remove .NET Framework versions 3.0 or lower. If you have Windows XP, you can't remove .NET Framework versions 2.0 or lower.
8. Click Cleanup Now.
9. Restart the computer once the .NET Framework component is removed.
10. Download and install the following components, one at a time, based on your operating system:
    • .NET Framework 1.1 - For Windows XP only.
    • .NET Framework 1.1 SP1 - For Windows XP only.
    • .NET Framework 3.5 SP1 - For Windows XP, Windows Vista, and Windows 7.
    • .NET Framework 4.0 - For Windows XP, Windows Vista, and Windows 7.
11. Restart the computer, and run Windows Update to install updates.