Error message when you try to install updates on a computer that is running Windows Vista: "WBEM_E_CLASS_HAS_INSTANCES (0x80041026)"

When you try to install updates on a computer that is running Windows Vista, the installation process fails. Additionally, you receive the following error message:
Note This issue may occur when you try to install Windows Vista Service Pack 1 (SP1).

To resolve this issue, follow these steps:

1. Click Start, and then type cmd in the Start Search box.
2. In the Programs list, right-click cmd, and then click Run as administrator.
   
   If you are prompted for an administrator password or for confirmation, type your password, or click Continue.
3. At the command prompt, type the following, and then press ENTER:
   wmic /namespace:\\root path __namespace where (name="SecurityCenter") delete
4. Install the update again.

More information for advanced users

This issue occurs when the Managed Object Format (MOF) file that is associated with Security Center (Wscenter.mof) has been modified in a way that makes it incompatible with the update process.

By performing the procedure in the "Resolution" section, you use the MOF compiler, Mofcomp.exe, to register the original MOF file. (Mofcomp.exe is included with Windows.) The Windows Vista SP1 update replaces the original MOF file registration, and this behavior causes the problem that is described in the "Symptoms" section. After you restore the original MOF file registration, install the update again.

For more information about the MOF compiler, visit the following Microsoft Web site: For more information about errors that you may encounter when you install Windows Vista Service Pack 1, click the following article numbers to view the articles in the Microsoft Knowledge Base: