diff -du qemu-8d3bc51\qemu-thread-win32.c
qemu-8d3bc51-new\qemu-thread-win32.c
--- qemu-8d3bc51\qemu-thread-win32.c    Tue Dec 27 17:28:58 2011
+++ qemu-8d3bc51-new\qemu-thread-win32.c    Thu Dec 29 18:59:50 2011
@@ -215,8 +215,6 @@
     if (data->mode == QEMU_THREAD_DETACHED) {
         g_free(data);
         data = NULL;
-    } else {
-        InitializeCriticalSection(&data->cs);
     }
     TlsSetValue(qemu_thread_tls_index, data);
     qemu_thread_exit(start_routine(thread_arg));
@@ -287,6 +285,10 @@
     data->arg = arg;
     data->mode = mode;
     data->exited = false;
+
+    if (data->mode != QEMU_THREAD_DETACHED) {
+        InitializeCriticalSection(&data->cs);
+    }

     hThread = (HANDLE) _beginthreadex(NULL, 0, win32_start_routine,
                                       data, 0, &thread->tid);