How to make Demo of an application.

Armadillo is a commercial product that locks your executable according to your requirements:
http://www.siliconrealms.com/
Product details:
http://store.digitalriver.com/store/srealms/ContentTheme/pbPage.software-passport-product-information

we use it with our products, it is very good

*********************************************************************************************
The Following is to fetch the system variables


Imports System.Management
Imports System.Collections
Imports System.IO

Public Class HardwarInfo
    Friend DevicesArr() As String = {"Win32_Processor", "Win32_Keyboard", "Win32_PointingDevice", "Win32_CDROMDrive", "Win32_DiskDrive", _
                            "Win32_FloppyDrive", "Win32_TapeDrive", "Win32_1394Controller", "Win32_BaseBoard", "Win32_MotherboardDevice", _
                            "Win32_BIOS", "Win32_Bus", "Win32_CacheMemory", "Win32_FloppyController", "Win32_IDEController", _
                            "Win32_InfraredDevice", "Win32_IRQResource", "Win32_MemoryArray", "Win32_MemoryDevice", "Win32_OnBoardDevice", "Win32_ParallelPort", "Win32_PCMCIAController", _
                            "Win32_PhysicalMemory", "Win32_PhysicalMemoryArray", "Win32_PNPEntity", "Win32_PortConnector", "Win32_PortResource", _
                            "Win32_SCSIController", "Win32_SerialPort", "Win32_SerialPortConfiguration", "Win32_SMBIOSMemory", _
                            "Win32_SoundDevice", "Win32_SystemEnclosure", "Win32_SystemMemoryResource", "Win32_SystemSlot", _
                            "Win32_USBController", "Win32_USBHub", "Win32_NetworkAdapter", "Win32_NetworkAdapterConfiguration", _
                            "Win32_AssociatedBattery", "Win32_Battery", "Win32_CurrentProbe", "Win32_PortableBattery", "Win32_UninterruptiblePowerSupply", _
                            "Win32_VoltageProbe", "Win32_Printer", "Win32_POTSModem", _
                            "Win32_POTSModemToSerialPort", "Win32_DesktopMonitor", "Win32_DisplayConfiguration", "Win32_DisplayControllerConfiguration", _
                            "Win32_VideoConfiguration", "Win32_VideoController", "Win32_Fan", "Win32_HeatPipe", "Win32_Refrigeration", "Win32_TemperatureProbe"}

    Enum Devices
        Win32_Processor
        Win32_Keyboard
        Win32_PointingDevice
        Win32_CDROMDrive
        Win32_DiskDrive
        Win32_FloppyDrive
        Win32_TapeDrive
        Win32_1394Controller
        Win32_BaseBoard
        Win32_MotherboardDevice
        Win32_BIOS
        Win32_Bus
        Win32_CacheMemory
        Win32_FloppyController
        Win32_IDEController
        Win32_InfraredDevice
        Win32_IRQResource
        Win32_MemoryArray
        Win32_MemoryDevice
        Win32_OnBoardDevice
        Win32_ParallelPort
        Win32_PCMCIAController
        Win32_PhysicalMemory
        Win32_PhysicalMemoryArray
        Win32_PNPEntity
        Win32_PortConnector
        Win32_PortResource
        Win32_SCSIController
        Win32_SerialPort
        Win32_SerialPortConfiguration
        Win32_SMBIOSMemory
        Win32_SoundDevice
        Win32_SystemEnclosure
        Win32_SystemMemoryResource
        Win32_SystemSlot
        Win32_USBController
        Win32_USBHub
        Win32_NetworkAdapter
        Win32_NetworkAdapterConfiguration
        Win32_AssociatedBattery
        Win32_Battery
        Win32_CurrentProbe
        Win32_PortableBattery
        Win32_UninterruptiblePowerSupply
        Win32_VoltageProbe
        Win32_Printer
        Win32_POTSModem
        Win32_POTSModemToSerialPort
        Win32_DesktopMonitor
        Win32_DisplayConfiguration
        Win32_DisplayControllerConfiguration
        Win32_VideoConfiguration
        Win32_VideoController
        Win32_Fan
        Win32_HeatPipe
        Win32_Refrigeration
        Win32_TemperatureProbe
    End Enum


    Private Searcher As ManagementObjectSearcher
    Private Device As ManagementObject

    Public Function GetDeviceInfos(ByVal DeviceName As Devices) As Hashtable

        Dim DeviceInfosArr As New Hashtable

        If DevicesArr(DeviceName).IndexOf("NetworkAdapter") > 0 Then
            Searcher = New ManagementObjectSearcher("SELECT * FROM " & DevicesArr(DeviceName) & " where IPEnabled=TRUE")
        Else
            Searcher = New ManagementObjectSearcher("SELECT * FROM " & DevicesArr(DeviceName))
        End If

        For Each Device In Searcher.Get
            For Each Prop As PropertyData In Device.Properties
                If Not DeviceInfosArr.ContainsKey(Prop.Name) Then
                    DeviceInfosArr.Add(Prop.Name, Prop.Value)
                End If
            Next
        Next

        Return DeviceInfosArr
    End Function
End Class
*********************************************************************************************

*********************************************************************************************
The Following function is an example to check the hardware info using the class

Private Function isRegistered() As Boolean
        If Command() <> "#PAMA#ADMCPA#ACD#" Then
            Dim HardInfo As New HardwarInfo
            Dim Checker As New MyEncryptor("123")
            Dim Deviceinfo As New Hashtable
            Dim F As New StreamReader("RegFile.reg", False)
            Dim strKey As String = F.ReadLine()

            Deviceinfo = HardInfo.GetDeviceInfos(HardwarInfo.Devices.Win32_NetworkAdapterConfiguration)
            strKey = Checker.Decrypt(strKey)
            If strKey = Deviceinfo("MACAddress") Then
                Return True
            Else
                Return False
            End If
        Else
            Return True
        End If
    End Function


Hope this would be helpful.

Sorry The Code is written in Vb.net.

Your application is compiled and ready for shipping. So, I wouldn't waste any time to develop my own code to protect my executable (by the way, pretty easy to reverse engineer), Instead try to use the famous InstallShield (http://www.flexerasoftware.com/products/installshield.htm) - a software that helps you build your protected installation file as easy as "next, next, finish", or other specific software, like install-us (http://www.install-us.com/). By doing so, you can fulfill all your requirements. Gook luck! Hope we'll see you beat Mr. Gates anytime soon!

Glad to see that other person coincides that it is better to use a commercial product (my previous post suggest Armadillo).