Press Windows key + R to open up a Run dialog box.Several affected users have reported being able to resolve the Setup failed – 0x80070666 installation error by uninstalling the newer version. In most cases, the error appears when the user tries to install Visual C++ Redist 2015 but a newer installation is already present on that system. Method 1: Uninstalling all current Visual C++ Redistributable packagesĪs a lot of users have reported, this particular issue is mostly occurring if your computer already contains a version (older or newer) of the same distributable package that you’re trying to install. One of them is bound to resolve the issue in your particular scenario.

The methods are ordered by efficiency and severity, so please follow them in the order that they are presented. Down below, you have several potential fixes that other users in a similar situation have successfully used to get the issue resolved. If you’re currently for a fix that will allow you to bypass the 0x80070666 error and complete the installation of the distribution package, this article will provide you with several troubleshooting methods. In this case, installing every pending Windows update should resolve the issue automatically.

Windows Update is planning on installing the same Visual C++ package – Another scenario in which you might encounter this particular issue is if the updating component (Windows Update) has a pending update that will update the same Visual C++ package.

Whenever this occurs, you have little other choices that running a specialized Fix-it tool or trying to force the Repair screen to pop up using Command Prompt.

Bad Visual C++ installation – There are certain scenarios that might end up contributing to a bad installation of the Visual C++ Redistributable package.

In this case, uninstalling the newer Visual C++ should resolve the issue. If you already have Visual C++ Redist 2017 and you’re trying to install the 2015 Redist, you’ll likely see this particular error message.

Another Visual C++ installation is already present – As it turns out, Visual C++ 2015 and Visual C++ 2017 will contain some common binary files that are known to conflict.

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