Disable Ctrl-Alt-Del in Win9x and Win NT/2K/XP too

The following code will demonstrate how to disable Ctrl-Alt-del in Win 9x platform, and how to disable various options in the Ctrl-Alt-Del List in Win NT/2K/XP. To understand the code, you must know how to use the Api functions, although I have tried to keep all the api's in seperate classes. There is also a class which determines if the OS is from Win9x or Win NT series. Hope you would fine some use for it.