wusa: Restart 64-bit version from the system32 directory.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>

programs/wusa/main.c

@@ -1023,7 +1023,8 @@ static void restart_as_x86_64(void)
 
     memset(&si, 0, sizeof(si));
     si.cb = sizeof(si);
-    GetModuleFileNameW(0, filename, MAX_PATH);
+    GetSystemDirectoryW( filename, MAX_PATH );
+    wcscat( filename, L"\\wusa.exe" );
 
     Wow64DisableWow64FsRedirection(&redir);
     if (CreateProcessW(filename, GetCommandLineW(), NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi))