You may want to start from your desired program, and see if it can 'see' your camera. Assuming it is connected to your PC by a USB port, the program should allow you to open that port. You can also change the file types associated with programs, changing the file type of your camera files to be opened with your desired program.
What program are you using, and what is your OS (Win 2000, Win XP, Vista, etc.)?