Firewall and security software are known for interfering with images on web sites.
If you have Norton Personal Firewall Or Norton Internet Security software, you need to modify the Privacy setting so you can see the images.
Find the options for "Privacy control" and uncheck "Enable Browser Privacy". Other firewall programs may have similar settings.
Or you may need to add our web site in to the "trusted" sites of the software. See your software manual or web site for instructions on how to do this.