没有看到引发异常的代码，也不知道您使用的是哪种病毒软件，就不可能告诉你怎么了.

Without seeing the code around the line that''s throwing the exception and knowing which virus software you''re using, it''s impossible to tell you what''s wrong.

戴夫，
我的代码是这样的:

Hi Dave,
my code goes like this:

private void Form1_Load(object sender, EventArgs e)    {      
string MName= lstMachineName.SelectedItem.ToString();
label1.Text = "Company ="+Antivirus("companyName","MName");

     
 label2.Text = "Name =" +Antivirus("displayName", "MName");  
}    
private string Antivirus(string type,string MName)    
{      
   
string wmipath = @"\\" + MName@"\root\SecurityCenter";      
try
    {        
ManagementObjectSearcher searcher = new ManagementObjectSearcher(wmipath,          "SELECT * FROM AntivirusProduct");        ManagementObjectCollection instances = searcher.Get();        
//MessageBox.Show(instances.Count.ToString());         
foreach (ManagementObject queryObj in instances)        
{          
return queryObj[type].ToString();        
}      
}      
catch (Exception e)     
 {       
 MessageBox.Show(e.Message);   
   }     
 return null;   
 }

该代码适用于computer.Environmenr或计算机名称为."(当前运行的计算机)，但对于远程服务器计算机名称则抛出错误:无效的名称空间.

The code works fine for the computer.Environmenr or when machine name is "."(current running machine), but for remote server machine names its throwing an error:invalid namespace.