AppFabric 1.1 error in SharePoint Server 2013 installation

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SYMPTOMS
While installing the SharePoint Server 2013 prerequisites, you see the following error in the event log and the setup log:

Product: AppFabric 1.1 for Windows Server -- Error 1722. There is a problem with this Windows Installer package. A program run as part of the setup did not finish as expected. Contact your support personnel or package vendor.  Action Env_PSModulePath_powershell_i, location: c:\Program Files\AppFabric 1.1 for Windows Server\Microsoft.ApplicationServer.InstallHelper.exe, command: powershell.exe "-command \"$str = [System.Environment]::GetEnvironmentVariable( \\\"PSModulePath\\\ ", [System.EnvironmentVariableTarget]::Machine); $str = $str+\\\";c:\Program Files\AppFabric 1.1 for Windows Server\PowershellModules\\\"; c:\Windows\system32\setx.exe /M PSModulePath \\\"$str\\\"\ "" "C:\Users\Administrator\AppData\Local\Temp\AppServerSetup1_1_CustomActions(2014-5-15 11-08-45).log"

CAUSE
The PSModulePath environment variable is corrupted. There is a quotation mark at the end.

C:\Windows\system32\WindowsPowerShell\v1.0\Modules\;C:\Program Files (x86)\Microsoft SQL Server\110\Tools\PowerShell\Modules;c:\Program Files\AppFabric 1.1 for Windows Server\PowershellModules"

RESOLUTION
Delete the ending quotation mark and re-run the setup.