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Error 1721: How to Fix This Windows Installer Problem
Try running the app in compatibility mode
5 min. read
Updated onOctober 4, 2023
updated onOctober 4, 2023
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Key notes
Windows Installer is an essential Windows service, especially when you want to install programs. However, things don’t always go as planned, with users reporting an error code 1721. This error is accompanied by athere is a problem with this Windows installer packagemessage.
Another similar error is1722, but we’ve already covered that. Windows Installer can be used to install, repair, configure, and uninstall software while adding or removing features from a user’s computer. So why is it throwing the error 1721? Let’s find out.
Why am I getting the error 1721?
This common error occurs when there is an incompatibility between the Windows Installer and some other program on your computer.
The Windows Installer service allows your OS to install, modify, and repair applications provided as Windows Installer packages.
It also detects changes in hardware and software that might affect applications. Since it acts as a point of control for all phases of the application installation process, if it fails, apps that depend on it may fail to launch.
Some of the reasons you’re getting the 1721 error when you try to install apps include:
How do I fix error 1721?
Ensure you fulfill the following prerequisites before attempting the complex solutions below:
1. Restart the Windows Installer service
2. Run the Program Install and Uninstall troubleshooter
The Program Install and Uninstall troubleshooter helps you identify and fix problems that occur when installing or uninstalling programs on your computer. It can also help you uninstall programs that are causing problems with your computer.
3. Install the problematic app in compatibility mode
Compatibility mode is a feature of Windows that lets you run older programs on your computer. It’s not exactly the same as running an older operating system, but it allows you to run some older programs that won’t work otherwise.
Many applications are written for earlier versions of Windows and have been tested only on those versions. When you try to run them on a newer version, you may find that they don’t work properly or at all.
This is because applications can use features only available on older versions of Windows and not on newer versions.
That’s it for the error 1721, but also check out our other article on what to do when youcan’t access the Windows installer service.
We also have an expert recommendation list of thebest installer software package, so don’t hesitate to visit that guide.
We’d love to hear your thoughts on this error and which solution helped you bypass it, so drop us a comment below.
Claire Moraa
Windows Software Expert
Claire has a knack for solving problems and improving the quality of life for those around her. She’s driven by rationality, curiosity, and simplicity, and always eager to learn more about Microsoft’s products. With a background in teaching and reviewing, she breaks down complex topics into easily understandable articles, focusing mostly on Windows 11, errors, and software.
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Claire Moraa
Windows Software Expert
With a background in teaching and reviewing, she breaks down complex topics into easily understandable articles, focusing mostly on Windows 11 errors.
