Let’s take a closer look at the following solutions, and see if they help you out.

How to fix Only one instance of Wusa.exe is allowed to run error?

1. Windows Installer check-up

If you’re getting Only one instance of wusa.exe is allowed to run error, you need to check if  Windows Installer service is running or not.

2. View your Event Log

If you’re getting Only one instance of wusa.exe is allowed to run error, you might be able to find the cause by visiting the Event Log. To do that, follow these steps:

3.Run Task Manager

You can also fix Only one instance of wusa.exe is allowed to run error by using Task Manager. Follow these steps:

4. Re-register Windows Installer

Another way to fix Only one instance of wusa.exe is allowed to run error is to re-register Windows Installer. To do that, follow these steps:

5. Reinstall Windows Installer in Safe Mode

Just boot your machine into Safe Mode, from the Advanced startup options. And now try to run the update. Remember that wusa.exe enables the appropriate function in the Windows Update Agent according to the mode in which you start wusa.exe. Tip In the event that this issue persists,  you may want to reset the Windows Update Components and see if that solves the issue. When running an update, make sure to momentarily disable any anti-virus software running in the background, for it may be interfering with your connection. We hope that these fixes were able to help you fix the Only one instance of wusa.exe is allowed to run error. In the meantime, let us know what other types of errors have you stumbled upon recently. RELATED STORIES TO CHECK OUT:

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