putting a file on client side

My requirement :
***I am giving my client facility to download my exe from my website but i want ,other person if copies that exe should not be able to install that application on his system.
Means,I want to put a file on client's m/c without knowledge of client which i will use for my own privacy/security.
Plz tell me how i can do that
***through cookies or any other way??

want to put a file on client's m/c without knowledge of client

Thank goodness, there is no way to install such spyware or other malware on a client system.
[ May 21, 2006: Message edited by: Bear Bibeault ]

If it were possible to install a program on the client machine without the user noticing, then that would be a severe security vulnerability, and we would call it a virus or trojan horse or something of that nature. You need to take other steps to ensure that the executable only runs on those machines where you want it to run on.