C# .NET 2 异常:外部组件引发异常

我在 c# 2 应用程序中进行了开发。一个 ASP .NET Web 服务和一个使用该 Web 服务的 WinForms 客户端。客户端分发给许多客户。对于其中一个客户，应用程序突然开始引发以下异常：

External component has thrown an exception.
at System.Diagnostics.SharedPerformanceCounter.GetCounter(String counterName, String instanceName, Boolean enableReuse, PerformanceCounterInstanceLifetime lifetime)
at System.Diagnostics.SharedPerformanceCounter..ctor(String catName, String counterName, String instanceName, PerformanceCounterInstanceLifetime lifetime)
at System.Diagnostics.PerformanceCounter.Initialize()
at System.Diagnostics.PerformanceCounter.set_RawValue(Int64 value)
at System.Net.NetworkingPerfCounters.Initialize()
at System.Net.Configuration.SettingsSectionInternal..ctor(SettingsSection section)
at System.Net.Configuration.SettingsSectionInternal.get_Section()
at System.Net.ServicePointManager.set_Expect100Continue(Boolean value)
at #Neh.#hgh.#P0f(String[] args)

异常末尾的混淆（使用 SmartAssembly 5）函数是客户端的主要函数，

如下所示

public static void Main(string[] args) {
    try {
        AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);
        Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);
        System.Net.ServicePointManager.Expect100Continue = false;
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Globals.Settings.NoWaitPrintJobs = true;
        Application.Run(new frmMain());
    }
    catch(Exception ex) {
        HandleUnhandledException(ex);
    }
}

从异常中，我知道它正在在线中断

System.Net.ServicePointManager.Expect100Continue = false;

应用程序不引用任何互操作组件，只引用其他托管 dll。它还在 shell32 中使用了本机函数.dll

[DllImport("shell32.dll")]
static extern bool SHGetSpecialFolderPath(IntPtr hwndOwner, [Out] StringBuilder lpszPath, int nFolder, bool fCreate);

这是在从静态对象主窗体加载事件上调用的。

Globals.Settings.InitLocalFiles();

我还不知道客户的电脑规格。我认为他有Windows XP。有什么想法吗？