Index: /trunk/src/VBox/VMM/VMMR3/NEMR3Native-win.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/NEMR3Native-win.cpp	(revision 73181)
+++ /trunk/src/VBox/VMM/VMMR3/NEMR3Native-win.cpp	(revision 73182)
@@ -1171,4 +1171,5 @@
      * Some state init.
      */
+    pVM->nem.s.fA20Enabled = true;
     for (VMCPUID iCpu = 0; iCpu < pVM->cCpus; iCpu++)
     {