Index: /trunk/src/VBox/Additions/WINNT/Installer/VBoxGuestAdditionsW2KXP.nsh
===================================================================
--- /trunk/src/VBox/Additions/WINNT/Installer/VBoxGuestAdditionsW2KXP.nsh	(revision 46866)
+++ /trunk/src/VBox/Additions/WINNT/Installer/VBoxGuestAdditionsW2KXP.nsh	(revision 46867)
@@ -234,4 +234,5 @@
   !if $%VBOX_WITH_WDDM_W8% == "1"
     ${If} $g_strWinVersion == "8"
+    ${OrIf} $g_strWinVersion == "8_1"
       !ifdef VBOX_SIGN_ADDITIONS
         FILE "$%PATH_OUT%\bin\additions\VBoxVideoW8.cat"
@@ -394,4 +395,5 @@
   !if $%VBOX_WITH_WDDM_W8% == "1"
       ${If} $g_strWinVersion == "8"
+      ${OrIf} $g_strWinVersion == "8_1"
         ${LogVerbose} "Installing WDDM video driver for Windows 8..."
         ${CmdExecute} "$\"$INSTDIR\VBoxDrvInst.exe$\" driver install $\"$INSTDIR\VBoxVideoW8.inf$\" $\"$INSTDIR\install_drivers.log$\"" "false"