Microsoft's Windows Installer Cleanup Utility no longer available
The Windows Installer CleanUp Utility (MSICUU) was a last resort to work around problems with broken or partially installed Windows Installer (MSI) packages if the regular measures like uninstalling from Add/Remove Programs control panel have failed. Officially it was available to fix broken installations of Microsoft Office but could be used for any msi based install.
Unfortunately many web sites recommended the tool as a simple way to fix any msi problems, and some users damaged their operating environment by misusing the Windows Installer CleanUp Utility.
As reported by The Windows Club two days ago, Microsoft has removed the MSICUU download from their web site. Knowledge base article 290301 has been updated with the following notice:
This article previously contained a link to the Windows Installer Cleanup utility (MSICUU2.exe). If you were directed to this article to solve a problem installing a product other than Microsoft Office, please contact your software manufacturer for installation support on the product.
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. The Fix it Solutions in this article provide the ability to fully remove Office 2003, 2007 and 2010 suites without damaging other Windows components.
Instead of the Windows Installer CleanUp Utility the knowledge base article now includes "Fix It" tools in the form of msi packages to safely remove broken installations of Office 2003, 2007 and 2010. Since the Fix It tools are packaged as msi files, this won't help in situations where you can't run any msi setup.
MSICUU could also be used to clean the Windows Installer cache from msi files that were no longer needed because the software had already been uninstalled. This could be useful in low disk space situations. I don't know if the mentioned problems also apply to this use of the tool.