Disable Task Manager/Alt +Ctrl+delete

Yes,you can certainly disable Your Task manager,for some security reasons.For that

1- Click start menu > click Run to open Run dialog box. Type regedit to run Windows Registry Editor.
2- Go to following address:

 

HKEY_Current_User\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

3- Create a New DWORD value, name it as DisableTaskMgr, and give it value of 1.
4- To enable Task Manager again, delete created key.