There's one for sale here......its still in copyright so you cant d/l it legally.
http://cgi.ebay.co.uk...S&hash=item45f91bbf22
However it seems like you may have a modern PC as its running Vista, does it have a floppy disc drive as games this old tended to come on floppies rather than a cdrom.
Also to get the game to run on a modern PC you may also need to get a program of the net called DOSBOX which allows you to emulate an MSDOS operating system.
www.dosbox.com
Its fiddly if you are not up on MSDOS as you have to set up settings for memory, sound and graphics etc and to be perfectly honest probably not worth all the effort unless you absolutely must have it.
Good Luck!!!