diff --git a/lib/ansible/modules/windows/setup.ps1 b/lib/ansible/modules/windows/setup.ps1
index bd2f6ac8c76..3e3317d0450 100644
--- a/lib/ansible/modules/windows/setup.ps1
+++ b/lib/ansible/modules/windows/setup.ps1
@@ -60,7 +60,7 @@ Set-Attr $result.ansible_facts "ansible_hostname" $env:COMPUTERNAME;
 Set-Attr $result.ansible_facts "ansible_fqdn" "$([System.Net.Dns]::GetHostByName((hostname)).HostName)"
 Set-Attr $result.ansible_facts "ansible_system" $osversion.Platform.ToString()
 Set-Attr $result.ansible_facts "ansible_os_family" "Windows"
-Set-Attr $result.ansible_facts "ansible_os_name" $win32_os.Name.Split('|')[0]
+Set-Attr $result.ansible_facts "ansible_os_name" ($win32_os.Name.Split('|')[0]).Trim()
 Set-Attr $result.ansible_facts "ansible_distribution" $osversion.VersionString
 Set-Attr $result.ansible_facts "ansible_distribution_version" $osversion.Version.ToString()
 
diff --git a/lib/ansible/modules/windows/win_feature.ps1 b/lib/ansible/modules/windows/win_feature.ps1
index d0bb6140f4e..b64b266279e 100644
--- a/lib/ansible/modules/windows/win_feature.ps1
+++ b/lib/ansible/modules/windows/win_feature.ps1
@@ -27,48 +27,18 @@ $result = New-Object psobject @{
     changed = $false
 }
 
-If ($params.name) {
-    $name = $params.name -split ',' | % { $_.Trim() }
-}
-Else {
-    Fail-Json $result "mising required argument: name"
+$name = Get-Attr $params "name" -failifempty $true
+$name = $name -split ',' | % { $_.Trim() }
+
+$state = Get-Attr $params "state" "present"
+$state = $state.ToString().ToLower()
+If (($state -ne 'present') -and ($state -ne 'absent')) {
+    Fail-Json $result "state is '$state'; must be 'present' or 'absent'"
 }
 
-If ($params.state) {
-    $state = $params.state.ToString().ToLower()
-    If (($state -ne 'present') -and ($state -ne 'absent')) {
-        Fail-Json $result "state is '$state'; must be 'present' or 'absent'"
-    }
-}
-Elseif (!$params.state) {
-    $state = "present"
-}
-
-If ($params.restart) {
-    $restart = $params.restart | ConvertTo-Bool
-}
-Else
-{
-    $restart = $false
-}
-
-if ($params.include_sub_features)
-{
-    $includesubfeatures = $params.include_sub_features | ConvertTo-Bool
-}
-Else
-{
-    $includesubfeatures = $false
-}
-
-if ($params.include_management_tools)
-{
-    $includemanagementtools = $params.include_management_tools | ConvertTo-Bool
-}
-Else
-{
-    $includemanagementtools = $false
-}
+$restart = Get-Attr $params "restart" $false | ConvertTo-Bool
+$includesubfeatures = Get-Attr $params "include_sub_features" $false | ConvertTo-Bool
+$includemanagementtools = Get-Attr $params "include_management_tools" $false | ConvertTo-Bool
 
 $name = $name.split(",")
 
diff --git a/lib/ansible/modules/windows/win_group.ps1 b/lib/ansible/modules/windows/win_group.ps1
index febaf47d014..c3fc920c916 100644
--- a/lib/ansible/modules/windows/win_group.ps1
+++ b/lib/ansible/modules/windows/win_group.ps1
@@ -24,35 +24,31 @@ $params = Parse-Args $args;
 $result = New-Object PSObject;
 Set-Attr $result "changed" $false;
 
-If (-not $params.name.GetType) {
-    Fail-Json $result "missing required arguments: name"
+$name = Get-Attr $params "name" -failifempty $true
+
+$state = Get-Attr $params "state" "present"
+$state = $state.ToString().ToLower()
+If (($state -ne "present") -and ($state -ne "absent")) {
+    Fail-Json $result "state is '$state'; must be 'present' or 'absent'"
 }
 
-If ($params.state) {
-    $state = $params.state.ToString().ToLower()
-    If (($state -ne "present") -and ($state -ne "absent")) {
-        Fail-Json $result "state is '$state'; must be 'present' or 'absent'"
-    }
-}
-Elseif (-not $params.state) {
-    $state = "present"
-}
+$description = Get-Attr $params "description" $null
 
 $adsi = [ADSI]"WinNT://$env:COMPUTERNAME"
-$group = $adsi.Children | Where-Object {$_.SchemaClassName -eq 'group' -and $_.Name -eq $params.name }
+$group = $adsi.Children | Where-Object {$_.SchemaClassName -eq 'group' -and $_.Name -eq $name }
 
 try {
     If ($state -eq "present") {
         If (-not $group) {
-            $group = $adsi.Create("Group", $params.name)
+            $group = $adsi.Create("Group", $name)
             $group.SetInfo()
 
             Set-Attr $result "changed" $true
         }
 
-        If ($params.description.GetType) {
-            IF (-not $group.description -or $group.description -ne $params.description) {
-                $group.description = $params.description
+        If ($null -ne $description) {
+            IF (-not $group.description -or $group.description -ne $description) {
+                $group.description = $description
                 $group.SetInfo()
                 Set-Attr $result "changed" $true
             }
diff --git a/lib/ansible/modules/windows/win_msi.ps1 b/lib/ansible/modules/windows/win_msi.ps1
index 1c2bc8a3019..f1381e9bf23 100644
--- a/lib/ansible/modules/windows/win_msi.ps1
+++ b/lib/ansible/modules/windows/win_msi.ps1
@@ -21,36 +21,28 @@
 
 $params = Parse-Args $args;
 
-$result = New-Object psobject;
-Set-Attr $result "changed" $false;
+$path = Get-Attr $params "path" -failifempty $true
+$state = Get-Attr $params "state" "present"
+$creates = Get-Attr $params "creates" $false
+$extra_args = Get-Attr $params "extra_args" ""
 
-If (-not $params.path.GetType)
-{
-    Fail-Json $result "missing required arguments: path"
-}
+$result = New-Object psobject @{
+    changed = $false
+};
 
-$extra_args = ""
-If ($params.extra_args.GetType)
+If (($creates -ne $false) -and ($state -ne "absent") -and (Test-Path $creates))
 {
-    $extra_args = $params.extra_args;
-}
-
-If ($params.creates.GetType -and $params.state.GetType -and $params.state -ne "absent")
-{
-    If (Test-File $creates)
-    {
-        Exit-Json $result;
-    }
+    Exit-Json $result;
 }
 
 $logfile = [IO.Path]::GetTempFileName();
-if ($params.state.GetType -and $params.state -eq "absent")
+if ($state -eq "absent")
 {
-    msiexec.exe /x $params.path /qb /l $logfile $extra_args;
+    msiexec.exe /x $path /qn /l $logfile $extra_args
 }
 Else
 {
-    msiexec.exe /i $params.path /qb /l $logfile $extra_args;
+    msiexec.exe /i $path /qn /l $logfile $extra_args
 }
 
 Set-Attr $result "changed" $true;
diff --git a/lib/ansible/modules/windows/win_service.ps1 b/lib/ansible/modules/windows/win_service.ps1
index a70d82a4ef3..4ea4e2697a1 100644
--- a/lib/ansible/modules/windows/win_service.ps1
+++ b/lib/ansible/modules/windows/win_service.ps1
@@ -24,26 +24,25 @@ $params = Parse-Args $args;
 $result = New-Object PSObject;
 Set-Attr $result "changed" $false;
 
-If (-not $params.name.GetType)
-{
-    Fail-Json $result "missing required arguments: name"
-}
+$name = Get-Attr $params "name" -failifempty $true
+$state = Get-Attr $params "state" $false
+$startMode = Get-Attr $params "start_mode" $false
 
-If ($params.state) {
-    $state = $params.state.ToString().ToLower()
+If ($state) {
+    $state = $state.ToString().ToLower()
     If (($state -ne 'started') -and ($state -ne 'stopped') -and ($state -ne 'restarted')) {
         Fail-Json $result "state is '$state'; must be 'started', 'stopped', or 'restarted'"
     }
 }
 
-If ($params.start_mode) {
-    $startMode = $params.start_mode.ToString().ToLower()
+If ($startMode) {
+    $startMode = $startMode.ToString().ToLower()
     If (($startMode -ne 'auto') -and ($startMode -ne 'manual') -and ($startMode -ne 'disabled')) {
         Fail-Json $result "start mode is '$startMode'; must be 'auto', 'manual', or 'disabled'"
     }
 }
 
-$svcName = $params.name
+$svcName = $name
 $svc = Get-Service -Name $svcName -ErrorAction SilentlyContinue
 If (-not $svc) {
     Fail-Json $result "Service '$svcName' not installed"
diff --git a/lib/ansible/modules/windows/win_stat.ps1 b/lib/ansible/modules/windows/win_stat.ps1
index cf8c14a4d49..af9cbd7eca5 100644
--- a/lib/ansible/modules/windows/win_stat.ps1
+++ b/lib/ansible/modules/windows/win_stat.ps1
@@ -42,14 +42,14 @@ If (Test-Path $path)
     Set-Attr $result.stat "exists" $TRUE;
     $info = Get-Item $path;
     $epoch_date = Get-Date -Date "01/01/1970"
-    If ($info.Directory) # Only files have the .Directory attribute.
+    If ($info.PSIsContainer)
     {
-        Set-Attr $result.stat "isdir" $FALSE;
-        Set-Attr $result.stat "size" $info.Length;
+        Set-Attr $result.stat "isdir" $TRUE;
     }
     Else
     {
-        Set-Attr $result.stat "isdir" $TRUE;
+        Set-Attr $result.stat "isdir" $FALSE;
+        Set-Attr $result.stat "size" $info.Length;
     }
     Set-Attr $result.stat "extension" $info.Extension;
     Set-Attr $result.stat "attributes" $info.Attributes.ToString();
diff --git a/lib/ansible/modules/windows/win_user.ps1 b/lib/ansible/modules/windows/win_user.ps1
index b7be7e4eea3..ac40ced2cbc 100644
--- a/lib/ansible/modules/windows/win_user.ps1
+++ b/lib/ansible/modules/windows/win_user.ps1
@@ -16,7 +16,6 @@
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
-# WANT_JSON
 # POWERSHELL_COMMON
 
 ########
@@ -55,33 +54,21 @@ $result = New-Object psobject @{
     changed = $false
 };
 
-If (-not $params.name.GetType) {
-    Fail-Json $result "missing required arguments: name"
-}
-
-$username = Get-Attr $params "name"
+$username = Get-Attr $params "name" -failifempty $true
 $fullname = Get-Attr $params "fullname"
 $description = Get-Attr $params "description"
 $password = Get-Attr $params "password"
 
-If ($params.state) {
-    $state = $params.state.ToString().ToLower()
-    If (($state -ne 'present') -and ($state -ne 'absent') -and ($state -ne 'query')) {
-        Fail-Json $result "state is '$state'; must be 'present', 'absent' or 'query'"
-    }
-}
-ElseIf (!$params.state) {
-    $state = "present"
+$state = Get-Attr $params "state" "present"
+$state = $state.ToString().ToLower()
+If (($state -ne 'present') -and ($state -ne 'absent') -and ($state -ne 'query')) {
+    Fail-Json $result "state is '$state'; must be 'present', 'absent' or 'query'"
 }
 
-If ($params.update_password) {
-    $update_password = $params.update_password.ToString().ToLower()
-    If (($update_password -ne 'always') -and ($update_password -ne 'on_create')) {
-        Fail-Json $result "update_password is '$update_password'; must be 'always' or 'on_create'"
-    }
-}
-ElseIf (!$params.update_password) {
-    $update_password = "always"
+$update_password = Get-Attr $params "update_password" "always"
+$update_password = $update_password.ToString().ToLower()
+If (($update_password -ne 'always') -and ($update_password -ne 'on_create')) {
+    Fail-Json $result "update_password is '$update_password'; must be 'always' or 'on_create'"
 }
 
 $password_expired = Get-Attr $params "password_expired" $null
@@ -126,14 +113,10 @@ If ($groups -ne $null) {
     }
 }
 
-If ($params.groups_action) {
-    $groups_action = $params.groups_action.ToString().ToLower()
-    If (($groups_action -ne 'replace') -and ($groups_action -ne 'add') -and ($groups_action -ne 'remove')) {
-        Fail-Json $result "groups_action is '$groups_action'; must be 'replace', 'add' or 'remove'"
-    }
-}
-ElseIf (!$params.groups_action) {
-    $groups_action = "replace"
+$groups_action = Get-Attr $params "groups_action" "replace"
+$groups_action = $groups_action.ToString().ToLower()
+If (($groups_action -ne 'replace') -and ($groups_action -ne 'add') -and ($groups_action -ne 'remove')) {
+    Fail-Json $result "groups_action is '$groups_action'; must be 'replace', 'add' or 'remove'"
 }
 
 $user_obj = Get-User $username
@@ -141,7 +124,7 @@ $user_obj = Get-User $username
 If ($state -eq 'present') {
     # Add or update user
     try {
-        If (!$user_obj.GetType) {
+        If (-not $user_obj -or -not $user_obj.GetType) {
             $user_obj = $adsi.Create("User", $username)
             If ($password -ne $null) {
                 $user_obj.SetPassword($password)
@@ -200,13 +183,13 @@ If ($state -eq 'present') {
         If ($result.changed) {
             $user_obj.SetInfo()
         }
-        If ($groups.GetType) {
+        If ($null -ne $groups) {
             [string[]]$current_groups = $user_obj.Groups() | ForEach { $_.GetType().InvokeMember("Name", "GetProperty", $null, $_, $null) }
             If (($groups_action -eq "remove") -or ($groups_action -eq "replace")) {
                 ForEach ($grp in $current_groups) {
                     If ((($groups_action -eq "remove") -and ($groups -contains $grp)) -or (($groups_action -eq "replace") -and ($groups -notcontains $grp))) {
                         $group_obj = $adsi.Children | where { $_.SchemaClassName -eq 'Group' -and $_.Name -eq $grp }
-                        If ($group_obj.GetType) {
+                        If ($group_obj -and $group_obj.GetType) {
                             $group_obj.Remove($user_obj.Path)
                             $result.changed = $true
                         }
@@ -239,7 +222,7 @@ If ($state -eq 'present') {
 ElseIf ($state -eq 'absent') {
     # Remove user
     try {
-        If ($user_obj.GetType) {
+        If ($user_obj -and $user_obj.GetType) {
             $username = $user_obj.Name.Value
             $adsi.delete("User", $user_obj.Name.Value)
             $result.changed = $true
@@ -252,7 +235,7 @@ ElseIf ($state -eq 'absent') {
 }
 
 try {
-    If ($user_obj.GetType) {
+    If ($user_obj -and $user_obj.GetType) {
         $user_obj.RefreshCache()
         Set-Attr $result "name" $user_obj.Name[0]
         Set-Attr $result "fullname" $user_obj.FullName[0]