The specified account already exists - .NET Core RC2 tooling Preview 1


Recently and with the release of Visual Studio 2015 Update 3 and .NET Core RTM, I decided to uninstall my previous installation of Visual Studio 2015 Update 2 and have a fresh installation of Update 3. So I uninstalled Visual Studio completely and restarted my PC.

Now I decided to uninstall the Microsoft .NET Core 1.0 RC2 VS 2015 Tooling Preview 1 from Control Panel. It gives me the following error several times and then fails:

The specified account already exists.

and here is the error code:

0x80070643 - Fatal error during installation

In the log file, these lines are repeated several times:

[1760:1CA0][2016-07-01T02:30:32]i301: Applying execute package: WebToolsExtensionsVS14, action: Uninstall, path: (null), arguments: ' ARPSYSTEMCOMPONENT="1" MSIFASTINSTALL="7" SKIP_SETUP="1"'
[1760:1CA0][2016-07-01T02:30:39]e000: Error 0x80070643: Failed to uninstall MSI package.
[1760:1CA0][2016-07-01T02:30:39]e000: Error 0x80070643: Failed to execute MSI package.
[247C:2490][2016-07-01T02:30:39]e000: Error 0x80070643: Failed to configure per-machine MSI package.
[247C:2490][2016-07-01T02:30:39]w348: Application requested retry of package: WebToolsExtensionsVS14, encountered error: 0x80070643. Retrying...
asked on Stack Overflow Jun 30, 2016 by Vahid Amiri

3 Answers


This is a bug in the .NET Core Tools for VS2015 installer.

I got this error when I tried to uninstall all VS2015 related tools on Windows 10 (not reinstallation, because I want VS2017 instead). I uninstalled VS2015 before removing .NET Core Tools. While trying to remove .NET Core Tools, it tried to call WebToolsExtensionsVS14 for repair; WebToolsExtensionsVS14 failed because VS2015 no longer existed.

I found the MSI package for WebToolsExtensionsV14 in the package cache:

C:\ProgramData\Package Cache\{BFC344B0-DCDE-36EB-AB05-CB194F2BE946}v14.1.21111.0\packages\WebToolsExtensionsVS14_69.msi

and right-click uninstalled it. Then the .NET Core Tools uninstaller worked.

My recommendation is to remove core tools before removing VS itself.

I found some related issue here, after I figured it out.

answered on Stack Overflow Mar 14, 2017 by 1283822 • edited Dec 26, 2018 by Ian Kemp

As I said in the question, I had Visual Studio 2015 Update 2 uninstalled already, and couldn't uninstall the .NET Core tooling after that.

The fix was to INSTALL Visual Studio 2015 Update 3 and THEN uninstalling the .Net Core 1.0 Preview 1.

After that I successfully installed the Preview 2 version of the tooling and had no errors.

answered on Stack Overflow Jul 1, 2016 by Vahid Amiri

What has worked for me, was uninstalling chronologically all the versions of the .NET Core SDK and tools from the "Programs and Features" app. Then I was able to install .NET Core tools preview for Visual Studio version 2.0.3

answered on Stack Overflow Jan 13, 2017 by Federico Polezzi

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