Index: /trunk/src/VBox/Additions/WINNT/VBoxGuest/VBoxGuestPnP.cpp
===================================================================
--- /trunk/src/VBox/Additions/WINNT/VBoxGuest/VBoxGuestPnP.cpp	(revision 30200)
+++ /trunk/src/VBox/Additions/WINNT/VBoxGuest/VBoxGuestPnP.cpp	(revision 30201)
@@ -325,4 +325,7 @@
             hlpVBoxUnmapVMMDevMemory (pDevExt);
 
+            /* Free the memory balloon (if any) */
+            VBoxCleanupMemBalloon(pDevExt);
+
             if (pDevExt->nextLowerDriver != NULL)
             {