You can access the DNS-323 web interface by entering the IP address in a browser, but you can't ping it?? Double clicking the DNS-323 in Windows Explorer opens the web interface? That really doesn't make much sense.
Frequently when troubleshooting problems, "going back to basics" is key. The whole point is we are trying to get as much information about your setup as possible. You'll quickly find that if you can't be bothered to perform these steps people will be less willing to help.