win7:
hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure, IntPtr.Zero, 0);
XP:
hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
可以先执行win7的语句，如果返回的hHook是0，就再执行一次XP的方法。