You cannot install Windows Live OneCare and Forefront Client Security on the same computer

When you try to install Windows Live OneCare and Microsoft Forefront Client Security on the same computer, the second product that you try to install cannot be installed. The symptoms that you experience depend on the scenario in which you try to install the product.

Scenario 1

When you try to install Windows Live OneCare on a computer that has Forefront Client Security installed, the installation of Windows Live OneCare fails. Additionally, you receive the following error message:

Scenario 2

When you try to install Forefront Client Security on a computer that has Windows Live OneCare installed, the installation of Forefront Client Security fails. Additionally, you experience the following symptoms:

• When you use the Clientsetup.exe command-line program, the program exits, you receive the following error message:
  Microsoft Forefront Client Security -- Installation failed.
  See log 'C:\Program Files\Microsoft Forefront\Client Security\Client\Logs\Clientsetup.log' for more information.
• When you call the command line program (Clientsetup.exe) programmatically from a script or from a batch file, the following error level is returned:
  ERRORLEVEL 1603
• The following information is logged in the Clientsetup.log file:

  Time Microsoft Forefront Client Security (<versionnumber>) -- Installation started
  Time Hardware requirement check passed.
  Time OS requirement check passed.
  Time Software requirement check passed.
  Time Microsoft Windows OneCare Live has been found. Please remove that product and rerun client setup.
  Time Microsoft Forefront Client Security -- Installation failed.

• The following event is logged in the Application event log:

  Event Type: Error
  Event Source: MsiInstaller
  Event Category: None
  Event ID: 11724
  Description: Microsoft Forefront Client Security -- Installation failed. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Windows Live OneCare and Forefront Client Security are anti-malware products. Therefore, you cannot install both products on the same computer.

If you want to change the anti-malware program that you use, first uninstall the anti-malware program that is already installed. Then, install the anti-malware program that you want to use.

Forefront Client Security is malware protection software designed for businesses, and Windows Live OneCare is designed for consumers. Both products have different features to meet the needs of the corresponding target group.

If a university or an employer has licensed Forefront Client Security with home usage rights, you may be able to install Forefront Client Security on a home computer. If you already use Windows Live OneCare, you must decide which product you want to use. In this case, contact your corporate help desk or your university help desk to determine the following:

• Whether you can create a VPN connection to the network
• Whether the VPN connection requires a specific anti-malware product to be installed

For more information about Forefront Client Security, visit the following Microsoft Web site:For more information about Windows Live OneCare, visit the following Microsoft Web site: