You greatly, I killed a program to prevent, find a lot of information online, but I can't find delphi7 can indeed, only need Windows explorer cannot end is ok, no other requirements, like global hook, or three or double process guard. Can, but must use. Who can give me a code, really very urgent, news is my shadow, not at all, before they are for my own study database programming, and the other has no experience. Also please give point source greatly, so long as can. First thank you. But if written into the system service, seemingly heard that cannot be used in Windows 7, so temporarily don't consider this things.