C#程序运行出现一个错误,大家来看看

unhandled exception has occurred in a component in your application if you click continue the application willignore this error and attempt to continue
could not load type 'System.Net.Sockets.SocketAsyncEventArgs'......出现了一个这样的对话框. 内容大致是这样的.. 大家别给我解释,我明白,他说无法加载类型System.Net.Sockets.SocketAsyncEventArgs
真让人崩溃啊目标计算机 xp 32位已安装.net2.0 正确安装无错误.