Microsoft Windows Installer is a component of the Windows operating system. Windows Installer provides a standard foundation for installing and uninstalling software. Software manufacturers can create the setup of their products to use Windows Installer to help make software installation, maintenance, and uninstallation straightforward and easy.

When you install, uninstall, or update a program on a Windows-based computer, you may receive one of the following error messages. The Windows Installer Service could not be accessed. Windows Installer Service couldn't be started. Could not start the Windows Installer service on Local Computer. Error 5: Access is denied.

Reset this PC how to reset your PC. If you can’t install, uninstall, or update a desktop program in Windows 10, the Program Install and Uninstall troubleshooter can automatically fix common issues such as corrupted registry keys or incomplete uninstall data.

Connect the installation media you created to your nonfunctional PC. Start the PC using the installation media.

To determine which version of Windows you’re using, follow the steps in Method 1 or 2. If one method doesn’t work, try the other. Method 1: View the System window in Control Panel. Click Start, type system in the search box, and, under Control Panel, click System.

Upgrading from the 32-bit version to the 64-bit version of Windows requires that you reformat your hard disk, install the 64-bit version of Windows, and then reinstall everything else that you had on your device. For more information, see Create installation media for Windows.

Alternatively, if installation doesn't start automatically, browse the disc to find the program setup file, usually called Setup.exe or Install.exe. Open the file to start installation. How to install programs from online sources on Windows 10. See how to install programs from a disc from.

To update the 32-bit and 64-bit versions of Windows Server 2003 SP1, or to update the 64-bit versions of Windows XP, download the hotfix that is described in Microsoft Knowledge Base article 898715 instead of the 893803 (v2) package. The version number is 3.1.4000.2435.

Learn how to create installation media for installing or reinstalling Windows.

To install an .msu update package, run Wusa.exe together with the full path of the file. Note You can also double-click the .msu file to install the update package. You can use the following switches together with Wusa.exe. View help. Run Wusa.exe in quiet mode without user interaction.