Fix UiHost.exe Application Error in Windows 11/10

Solutions to “UiHost.exe Application Error was unable to start correctly UiHost.exe. Click OK to close the application” in Windows 11 and 10.

UiHost.Exe is the executable for McAfee Webadvisor browser extension where UiHost refers to User Interface Host. This component plays a pivotal role in various functions within the application and is designed to be compatible with major web browsers including Mozilla Firefox, Google Chrome, and Microsoft Edge among others. When a Windows system shows the UiHost.exe Application Error, that is a sign of a malfunction in the graphical user interface host process. It may arise from issues like corrupt system files, incompatible software, or malware which ultimately create issues in the UI and potentially lead to system instability or crashes. Are you facing this application error on your Windows 11 or 10? Well, don’t worry, we have you covered.

Full error message is, “UiHost.exe Application Error was unable to start correctly UiHost.exe. Click OK to close the application”. Here, we will reveal the possible causes of this Application Error which will include insights into corrupt installations, conflicting applications, or underlying system issues. Our focus will be on guiding you through effective solutions to resolve the application error on Windows 11/10 and get things up and running again.


UiHost.exe Application Error

Here is how to fix UiHost.exe Application Error in Windows 11/10:

Update the Browsers

An outdated web browser may trigger the problem on Windows 11 or 10 because of compatibility issues and conflicts with system files.

Updating this can resolve this issue instantly and ensure a smoother user interface experience:

Google Chrome

  • Open the Chrome browser and click on the “Menu” icon.
  • Go to “Help” => “About Google Chrome”.
how to fix UiHost.exe Application Error in Windows 11 and 10
  • Chrome will automatically check for updates and If it is available, download and install.
  • Then, restart the browser to apply the update and check for the issue.

Mozilla Firefox

  • Navigate to “hamburger menu (3 vertical lines)” on the browser and select “Help”.
  • Click on “About Firefox”.

Microsoft Edge

  • Navigate to “Menu icon > Help & feedback > About Microsoft Edge”.

See: How to Fix McAfee Error x5485 Unable to continue installation.

Update the McAfee WebAdvisor

Outdated McAfee WebAdvisor can trigger the error on Windows as it might be conflicting with your browser.

You can easily solve this application error by updating McAfee WebAdvisor by following these steps:

Chrome Browser

  • Open “Chrome” and Navigate to “Menu”.
  • Now, choose “Extensions” > “Manage Extensions”.
  • Turn on “Developer mode” using the toggle switch.
  • Then, select “Updates” and wait for the update to be completed.
Chrome manage extensions developer mode update


  • On the browser, go to Menu > Add-ons and themes.
  • Click on McAfee WebAdvisor and check the option “On” for “Allow automatic updates”.
  • Close the browser.

Microsoft Edge

  • Go to Menu > Extensions > Manage Extensions > Developer mode.
  • Enable the “Developer mode” and click on “Update”.

Disable Unnecessary Browser Extensions

Sometimes, WebAdvisor application errors are the result of issues associated with other extensions.

If that is the case, disable all other browser extensions to check whether the issue persists. Here is the process to disable extensions on Chrome:

  • Launch the Chrome browser click on “3 dots” menu and select “Extensions”.
  • Now, choose “Manage Extensions”, and disable all extensions except WebAdvisor.
  • If the error gets resolved, you can now enable the necessary extensions one by one and identify the one with the issue.

Check Your UiHost.exe File

UiHost.exe file can trigger UiHost.exe Application Error on Windows if the file is not genuine or under attack by malware. To confirm it and get the issue solved, follow the below steps:

  • Go to “C:\Program Files\McAfee\WebAdvisor\UIHost.exe”. Note that if the file is not located in this location, it might be a virus.
  • Right-click “UiHost.exe” and choose “Properties”.
  • Now, open the “Digital Signature” tab and look for the “Signature” column. You will see “McAfee” or “McAfee LLC”, otherwise, it can be malware and you should remove it.
  • Then, verify the “file size” which should be in KBs. If not, that may be malware and requires deletion.

Update Your Windows

Your Windows system may cause the Application Error due to outdated files or incompatible software. So, updating your Windows may resolve this issue and ensure a smooth and error-free performance.

Keep your Windows 11/10 up-to-date by applying these steps:

  • Click on the “Windows Start” button.
  • Type “Update” in the search box and hit “Enter”.
  • You will see Windows Update settings, here, click on “Check for Updates”.
  • If updates are available, click on “Install Updates”.
  • When the update is complete, restart your computer.

Read: Fix mfehidk.sys BSOD or Blue Screen Error in Windows 11/10

Reinstall McAfee Antivirus

In case, McAfee antivirus installation is faulty or any of the McAfee files get corrupted, you may see the UiHost.exe Application Error.

In this kind of situation, the best way to solve this error is to reinstall the application which can be done by following these steps:

  • Right-click on “Windows” to open “Installed apps”.
  • Find McAfee, click three dots, and hit “Uninstall”.
  • Follow on-screen instructions to finish the uninstallation process of the McAfee application.
  • After that, uninstall ALL McAfee products alongside the browser extensions.
  • Restart your system.
  • Now, download and reinstall the McAfee application from the official website.
  • Then, enable “Web Advisor” in your browser and check whether the issue is gone.

Update the Browsers
Update the McAfee WebAdvisor
Disable Unnecessary Browser ExtensionsUpdate Your Windows
Check Your UiHost.exe File
Update Your Windows
Reinstall McAfee Antivirus

That’s all!!

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Topics:  Windows
About Sunita
Love to play with Windows 11 and 10. Suggestion - Going for Registry change or system files edit then remember to take a backup or create a restore point before Starting.