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Windows Installer 4.5
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Applies to:

Windows Vista with SP1 installed






Windows Vista with SP1 installed
Click here for the Windows XP version

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The Microsoft Windows Installer is an 'application installation and configuration service'. This means that it is used for installing programs on your computer. Some software requires this latest download before you can install it. In effect, this becomes a two step process. First you download the Windows Installer and run it (restart your computer). Then run your software's installation program (yes, there is some degree of Microsoft kookiness that requires you to install an installation program before you can install the program you actually want).

According to Microsoft, this is the function of the package: 'It manages the installation and removal of applications by applying a set of centrally defined setup rules during the installation process. These setup rules define the installation and configuration of the installed application. In addition, you use this service to modify, repair, or remove an existing application.'

PC Mechanic - Fix your PC's Windows registry errors.