Well, if you have access to the router set up on your computer you may want to try a few things:
1. make a custom IP address for the PS3 under the DHCP settings and put that IP address into your PS3's network connection
2. Find what the router says are the DNS addresses and enter those in manually in your connection settings on the PS3
3. Go into the Port Forwarding of the router and open the following ports:
* TCP Ports: 80, 443, 5223, and 10070 - 10080
* UDP Ports: 3478, 3479, 3658, 10070, and 50100
Once this is all in place you should be able to get through the router. Unfortunately, I can't find an online manual for this particular model so i can't guide you as to where to click in the router pages.