How Can I Fix Error 1721 When Installing My Tax Software?

When you’re trying to install your H&R Block software, you might see H&R Block error 1721. If this error is showing up for you, you’ll need to unregister and re-register your Windows Installer Service.

To fix H&R Block error 1721 by unregistering and re-registering your Windows Installer Service:

1. Press the Windows Key + R on the keyboard.
2. In the Open box, type this exactly as shown with the space before the slash:
   msiexec /unregister
3. Once you’re sure that you’ve typed it in correctly, click OK. If the command you’ve entered has worked, you won’t see a notification.
4. Click Start, then choose Run.
5. In the Open box, type this exactly as shown with the space before the slash:
   msiexec /unregister
6. After ensuring that you’ve typed the command in correctly, click OK. If the command works, you won’t see a notification.
7. Restart your computer, and then try installing the product again.

With these steps done, H&R Block error 1721 should be fully resolved.

Additional Help for Fixing Error 1721

If you’ve gone through these steps and this error 1721 fix still isn’t working for you, contact an H&R Block support specialist for additional assistance. You can reach our specialists by calling 800-HRBLOCK (800-472-5625).