Msizap.exe is a command line utility that removes either all Windows Installer information for a product or all products installed on a computer. Products installed by the installer may fail to function after using Msizap.
On Windows 2000 and Windows XP, administrative privileges are required to use Msizap.exe.
This version of Windows Installer CleanUp Utility works correctly in all 32-bit and 64-bit versions of Microsoft Windows. If you have an earlier version installed on your computer, we recommend that you download and install this latest version.
You must be logged on to Windows with a user account that is a computer administrator to run Windows Installer CleanUp Utility. For more information about how to install and run Windows Installer CleanUp Utility.