Получаем список установленных обновлений Windows

string computer = ".";
ManagementScope scope = new ManagementScope(@"\\" + computer + @"\root\cimv2");
ManagementObjectSearcher quickFixes = new ManagementObjectSearcher(scope, new ObjectQuery("Select * from Win32_QuickFixEngineering"));

foreach (ManagementObject quickFix in quickFixes.Get())
{
    listBox1.Items.Add("----------------------------------------------------------------");
    listBox1.Items.Add(string.Format("Description: {0}", quickFix["Description"]));
    listBox1.Items.Add("ID: "+quickFix["HotFixId"]);
    listBox1.Items.Add("Caption: " + quickFix["Caption"]);
    listBox1.Items.Add("InstalledBy: " + quickFix["InstalledBy"]);
    listBox1.Items.Add("InstalledOn: " + quickFix["InstalledOn"].ToString().Replace("/","."));
}

Результат: