Удаляем принтер через WMI

public static bool DeletePrinter(string sPrinterName)
{
    ManagementScope oManagementScope = new ManagementScope(ManagementPath.DefaultPath);
    oManagementScope.Connect();

    SelectQuery oSelectQuery = new SelectQuery();
    oSelectQuery.QueryString = @"SELECT * FROM Win32_Printer WHERE Name = '" +
       sPrinterName.Replace("\\", "\\\\") + "'";

    ManagementObjectSearcher oObjectSearcher =
       new ManagementObjectSearcher(oManagementScope, oSelectQuery);
    ManagementObjectCollection oObjectCollection = oObjectSearcher.Get();

    if (oObjectCollection.Count != 0)
    {
        foreach (ManagementObject oItem in oObjectCollection)
        {
            oItem.Delete();
            return true;
        }
    }
    return false;
}