Cannot create a file when that file already exists. (Exception from HRESULT: 0x800700B7)

Trying to update a new CU6 installation to CU7 and I can't get past this error.  Please help.

Exchange Server component Mailbox role: Transport service failed.

Error: Error:

The following error was generated when "$error.Clear();

          $feVdirName = "PowerShell (Default Web Site)";

          $beVdirName = "PowerShell (Exchange Back End)";

          $vdirName = "PowerShell";

          $InternalPowerShellUrl="http://" + $RoleFqdnOrName + "/powershell";

          get-PowerShellVirtualDirectory -ShowMailboxVirtualDirectories -server $RoleFqdnOrName -DomainController $RoleDomainController | where { $_.Name -eq $beVdirName -or $_.Name -eq $feVdirName } | remove-PowerShellVirtualDirectory -DomainController $RoleDomainController;

          new-PowerShellVirtualDirectory $vdirName -Role Mailbox -DomainController $RoleDomainController -BasicAuthentication:$false -WindowsAuthentication:$true -RequireSSL:$true -WebSiteName "Exchange Back End" -Path ($RoleInstallPath + "ClientAccess\PowerShell-Proxy");

          new-PowerShellVirtualDirectory $vdirName -Role Mailbox -InternalUrl $InternalPowerShellUrl -DomainController $RoleDomainController -BasicAuthentication:$false -WindowsAuthentication:$false -RequireSSL:$false -WebSiteName "Default Web Site" -AppPoolId "MSExchangePowerShellFrontEndAppPool";

        " was run: "System.ArgumentException: The virtual directory 'PowerShell' already exists under 'NSCCEx13.administration.nashvilletech.int/Exchange Back End'.

Parameter name: VirtualDirectoryName

   at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target, Boolean reThrow, String helpUrl)

   at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target)

   at Microsoft.Exchange.Management.SystemConfigurationTasks.NewExchangeVirtualDirectory`1.InternalValidate()

   at Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__b()

   at Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)".

Error:

The following error was generated when "$error.Clear();

          $feVdirName = "PowerShell (Default Web Site)";

          $beVdirName = "PowerShell (Exchange Back End)";

          $vdirName = "PowerShell";

          $InternalPowerShellUrl="http://" + $RoleFqdnOrName + "/powershell";

          get-PowerShellVirtualDirectory -ShowMailboxVirtualDirectories -server $RoleFqdnOrName -DomainController $RoleDomainController | where { $_.Name -eq $beVdirName -or $_.Name -eq $feVdirName } | remove-PowerShellVirtualDirectory -DomainController $RoleDomainController;

          new-PowerShellVirtualDirectory $vdirName -Role Mailbox -DomainController $RoleDomainController -BasicAuthentication:$false -WindowsAuthentication:$true -RequireSSL:$true -WebSiteName "Exchange Back End" -Path ($RoleInstallPath + "ClientAccess\PowerShell-Proxy");

          new-PowerShellVirtualDirectory $vdirName -Role Mailbox -InternalUrl $InternalPowerShellUrl -DomainController $RoleDomainController -BasicAuthentication:$false -WindowsAuthentication:$false -RequireSSL:$false -WebSiteName "Default Web Site" -AppPoolId "MSExchangePowerShellFrontEndAppPool";

        " was run: "System.ArgumentException: The virtual directory 'PowerShell' already exists under 'NSCCEx13.administration.nashvilletech.int/Default Web Site'.

Parameter name: VirtualDirectoryName

   at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target, Boolean reThrow, String helpUrl)

   at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target)

   at Microsoft.Exchange.Management.SystemConfigurationTasks.NewExchangeVirtualDirectory`1.InternalValidate()

   at Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__b()

David