A. This can be done using the registry as follows

1. Start the Registry Editor
2. HKEY_CURRENT_USER\Software\Microsoft\windows\currentversion\Policies
3. If the \System key does not exist create it
4. Add a new value of type DWORD called DisableTaskMgr and set to 1
5. Exit registry editor

This can also be done using the policy editor

1. Start the Policy editor
2. Select the User, or edit the default User
3. Goto Shell/Restrictions and select "remove Taskbar from user"

To remove Task Manager for all users just rename taskmgr.exe to something else, or if it is on a NTFS partition you can set the permissions so normal users cannot access it.