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In short Microsoft hasn't handled the situation terribly well. Worse there's an issue in the Windows 10 uninstall app where the OS indicates that the update is not installed when it obviously is. They have to keep uninstalling the unwanted app because it keeps getting reinstalled every time a new OS update is applied. While that's technically true users have been pointing out that it's not a one time thing. Microsoft's response has been rather nonchalant responding that if people don't want the new app it's as simple as uninstalling it via the Settings app. Many users have taken to Reddit, Twitter, and other popular internet portals to blast the company for installing software they didn't ask for and don't necessarily want on their devices. The company's implementation here hasn't been well received. Although the new app is being designed for inclusion in Windows 11 Microsoft has made the decision to roll it out to Windows 10 users and force install it on users' systems. A diagnostic suite to help keep your machine running smoothly. PC Health Check is a new tool designed to help with troubleshooting Windows issues.
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If your system is set automatically receive Windows updates it may have appeared that the new app showed up by magic.
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The new app is part of a Windows 10 update. Rest assured that you didn't get infected with some type of malware. If you're one of the legions of Windows 10 users you may have recently noticed a new application on your machine.
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