using System;
using System.Management;

namespace WmiConnectRemote {
    class Program {
        static void Main(string[] args) {
            var machine = "computerName";
            var options = new ConnectionOptions { Username = @"domainName\userLogin", Password = "userPassword" };            
            var scope = new ManagementScope(@"\\" + machine + @"\root\cimv2", options);            
            var queryString = "select Name, Size, FreeSpace from Win32_LogicalDisk where DriveType=3";
            var query = new ObjectQuery(queryString);
            var worker = new ManagementObjectSearcher(scope, query);
            var results = worker.Get(); // Здесь получаю исключение
            foreach (ManagementObject item in results) {
                Console.WriteLine("{0} {2} {1}", item["Name"], item["FreeSpace"],
                    item["Size"]);
            }
        }
    }
}