Error message when you restart the computer after you uninstall a security update for the .NET Framework 1.1: "This application has requested the Runtime to terminate in an unusual way"

You uninstall a security update for the Microsoft .NET Framework 1.1. If the computer has the Microsoft .NET Framework 1.1 and the Microsoft .NET Framework 2.0 installed, you may receive the following error message when you restart the computer:

This issue may occur if the .NET Framework 2.0 installation is corrupted or damaged. Programs that require the .NET Framework 2.0 may no longer run. Additionally, some programs may display the error message that is mentioned in the "Symptoms" section or other program error messages.

To resolve this issue after you uninstall the security update for the .NET Framework 1.1, you must uninstall the .NET Framework 2.0. Then, you must reinstall the .NET Framework 2.0. To do this, follow these steps:

1. Uninstall the .NET Framework 2.0 from the computer by using Add or Remove Programs in Control Panel. Additionally, uninstall any beta version of the .NET Framework from the computer.
2. If you are prompted, restart the computer.
3. To reinstall the .NET Framework 2.0, visit the following Microsoft Web site:
   http://www.microsoft.com/downloads/details.aspx?familyid=0856EACB-4362-4B0D-8EDD-AAB15C5E04F5
4. If you are prompted, restart the computer when the installation is complete.
5. Reinstall the security updates that are applicable for the .NET Framework 2.0.

The .NET Framework 2.0 installs a file that is named the Mscorees.dll file. This file was updated after the original release of the .NET Framework 2.0.

Security bulletin MS07-040 contains information about the security update for the .NET Framework 1.1. Specifically, the following updates also install the Mscorees.dll file:

• Update 928366
• Update 929729
• Update 933854

After you install the security update for the .NET Framework 1.1, the Mscorees.dll file is a shared file between the .NET Framework 1.1 and the .NET Framework 2.0.

For more information about security bulletin MS07-040, click the following article number to view the article in the Microsoft Knowledge Base: Because of a limitation in Microsoft Windows Installer, Windows Installer does not correctly handle the shared file when you uninstall the security update for the .NET Framework 1.1.

Note Windows Installer is the technology behind the Setup program for the security update for the .NET Framework 1.1.

When you uninstall the security update for the .NET Framework 1.1, the Mscorees.dll file is incorrectly deleted from the computer. This issue may occur even though the Mscorees.dll file is required for the .NET Framework 2.0 to run correctly.

For more information about update 928366, about update 929729, and about update 933854, click the following article numbers to view the articles in the Microsoft Knowledge Base: