Enable or Disable Task Manager

If you wish to Enable or Disable the Task Manager

Open Registry Editor

Go to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

Now create a new Dword value named "DisableTaskMgr" and give it a value of 0 to enable it.
To disable it give a vaule of 1.

Most Frequently used programs list

Windows XP features the most frequently used programs list, which is designed to provide access to the programs you use the most.
XP provides you with only two configuration options: the ability to completely clear the list and the ability to specify the maximum number of programs that can appear on this list at any one time. However, you may also want to prevent certain applications, such as Calculator and Notepad, from appearing on the list.

Also you can prevent an application from appearing in the Start menu's most frequently used programs list by adding a special key to the registry. Here's how:

1. Open Registry Editor.
2. Go to HKEY_CLASSES_ROOT\Applications.
3. Right-click on the Applications key and select New | Key.
4. Give the key the same name as the application's executable file.
5. Right-click your new key and select New | String Value.
6. Name the string value NoStartPage.
7. Close the Registry Editor.
8. Reboot or log off and log back on for the change to take effect.