การ reset Always ask before opening this type of file

http://www.winhelponline.com/blog/reset-the-always-ask-before-opening-this-type-of-file-setting/

How to enable disable Ctrl + Alt + Del before logon XP or Vista

1. Windows + r and type control userpasswords2 (XP, Vista) or netplwiz (Vista only).




2. Goto advance tab on popup window. You can check the checkbox for enable ctrl + alt + del and uncheck the checkbox for disable ctrl + alt + del before logon.