Revert the shutdown command with new parameters as this will return proper exit codes. This will work in the same way as restart-computer -force when using ```shutdown /r /f /t 0```.

Note:The WinRM library does not return the exit code currently, this will be implemented on https://github.com/masterzen/winrm/pull/26

provisioner/windows-restart/provisioner.go

@@ -13,7 +13,7 @@ import (
 	"github.com/mitchellh/packer/template/interpolate"
 )
 
-var DefaultRestartCommand = "powershell \"& {Restart-Computer -force }\""
+var DefaultRestartCommand = "shutdown /r /f /t 0 /c \"packer restart\""
 var DefaultRestartCheckCommand = winrm.Powershell(`echo "${env:COMPUTERNAME} restarted."`)
 var retryableSleep = 5 * time.Second
 var TryCheckReboot = "shutdown.exe -f -r -t 60"

provisioner/windows-restart/provisioner_test.go

@@ -35,7 +35,7 @@ func TestProvisionerPrepare_Defaults(t *testing.T) {
 		t.Errorf("unexpected remote path: %s", p.config.RestartTimeout)
 	}
 
-	if p.config.RestartCommand != "powershell \"& {Restart-Computer -force }\"" {
+	if p.config.RestartCommand != "shutdown /r /f /t 0 /c \"packer restart\"" {
 		t.Errorf("unexpected remote path: %s", p.config.RestartCommand)
 	}
 }