.Net licensing with Registry

1- You must use your LicenseProvider on the top of your control class like:

[LicenseProvider(typeof(MYLicenseProvider))]

2- You must check the validation of License in constractor's control class by

LicenseManager.Validate(typeof(MYControl), this);

3- You must define you specified MYLicenseProvider and override GetLicense function and read something from registry and return a valid instance of "Licence".

PS: The promise is that you define your License class and return one object of that

public class MYLicense : License {...}

PS: Another application can fill up registry for use by this control

.Net Licensing with LIC file

Microsoft solution for Control .Net Licensing (that we call FILE LICENSING)
1- You must use the

[LicenseProvider(typeof(LicFileLicenseProvider))]

on the top of your control class
2- You must check the validation of License in constructor’s control class by

LicenseManager.Validate(typeof(MYControl), this);

3- To run the application, you must use one file (with below spec.) near the executable (or dll) control.
FileName: [MYControlNamespace].[MYControlClassname].lic
Content: [MYControlNamespace].[MYControlClassname] is a licensed component.

This is the most simple microsoft solution, that can be advance!

.Net Licensing

Step by Step with .Net Licensing (for Control or Form)
If you wanna build a control (that we called NewControl) and use the .Net Licensing for that, go ahead:

1-The licensed control requests a license from the LicenseManager in its constructor.
[PS1: LicenseManager is a sealed (not inheritable) class for provides usefull properties and methods for connecting to a LicenseProvider]

license = LicenseManager.Validate(typeof(NewControl), this);

2- The our LicenseManager rerequests a licence from the LicenseProvider with GetLicense().
[PS2:We can define our LicenseProvider at the top of our class's control (that we called NewLicenseProvider)]

[LicenseProvider(typeof(NewLicenseProvider))]
public class NewControl : System.Windows.Forms.Control{ ...}

3- We must declare a NewLicenseProvider of System.ComponentModel.LicenseProvider and override the GetLicense like :public

override License GetLicense(LicenseContext context, Type type, object instance, bool allowExceptions)

We want to talk more about this ...
If you have a problem on this field .. come on ... post a comment

Task Manager Disabled

Error: Task Manager has been disabled by your administrator
Error: Registry Editing has been disabled by your administrator

Microsoft Solution: Start > Run > gpedit.msc > Group Policy settings > User Configuration > Administrative Templates > System > Ctrl+Alt+Del Options > Remove Task Manager > Remove Task Manager
Microsoft Solution: Modify your registry

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]
  "DisableTaskMgr"=dword:00000000
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Group Policy Objects\
LocalUser\Software\Microsoft\Windows\CurrentVersion\Policies\System]
  "DisableTaskMgr"=dword:00000000
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
  "DisableTaskMgr"=dword:00000000
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon]
  "DisableCAD"=dword:00000000

But i think that you fall in virus Nice Trojan 2.0 (Trojan-Spy.Win32.VB.cs)
if you have NDDEN.EXE (c:\WINDOWS\NDDEN.exe) then you have a Persian Virus.
Here is the virus specifications:
Owner: Javad.M
Written: Visual Basic
Date: September 2004
Country: Persia(Iran)
File: C:\WINDOWS\NDDEN.exe
Size: 23,567 bytes
Registry:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
  "disableregistrytools"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
  "DisableTaskMgr"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  "Microsoft PCHealth32"