The Microsoft Installer Cleanup Utility has been retired:

While the Windows Installer Cleanup utility resolved some installation problems, it sometimes damaged other components installed on the computer. Because of this, the tool has been removed from the Microsoft Download Center. There is currently not a replacement tool that addresses issues with the bulk of applications installed using the Microsoft Installer Cleanup Utility; however there have been automated solutions and manual solutions that help to uninstall some of these applications. The following list offers currently available KB articles that do contain these automated and manual solutions:

Important Update:

An automated troubleshooter is available that can diagnoses problems that can prevent installing and uninstalling programs on your Windows-based computer. This troubleshooter can help with programs that do not uninstall correctly and with issues where programs may be blocking the installations of other programs. To run the troubleshooter, click Run Now on the following website:

Program Install and Uninstall troubleshooter

Note: The Windows Installer Cleanup utility (MSICUU2.exe) that was previously referred to in this article has been retired. The Program Install and Uninstall troubleshooter is a replacement for that utility.

If you need to uninstall Office version 2003, 2007, or 2010, a new FixIT solution is available in the following Microsoft Knowledge Base article:

How do I uninstall Office 2003, Office 2007, or Office 2010 suites if I cannot uninstall it from Control Panel?

If you need to uninstall Microsoft Security Essentials, see the following Microsoft Knowledge Base article:

How to manually uninstall Microsoft Security Essentials 2.0.1963 if you cannot uninstall it by using the Add or Remove Programs item

923100 When you try to install an update for the .NET Framework 1.0, 1.1, 2.0, 3.0, or 3.5, you may receive Windows Update error code "0x643" or Windows Installer error code "1603"

 Thanks

Bobby