I had this exact same problem after updating to 1.72. I tried the responses listed but nothing worked.I did find a workaround, however: (please note I have Comcast)
Disconnect your modem from your router and connect it to your computer
Wait until you can browse web pages, then press Windows Key + R (at the same time)
Type CMD and press enter
When the dialog box appears, type ipconfig /all
Right click inside the window and select Mark
Select all the text and right click, this will copy your IP settings
Open notepad and paste what you selected into the document, save it
Plug modem back into router and power on
Connect to the router and navigate to the web configuration interface
Click Internet/LAN and select Use This Address as your Method of Acquiring IP Address
In your notepad document, find the IPV4 address and enter it as the IP
Copy the Default Gateway, DNS servers and Physical Address into the Advanced Settings fields from your notepad document
Click Apply and let the router reboot. You should be able to navigate to web pages. If so, go back into the Internet/LAN settings and select Acquire an IP Address Automatically from a DHCP Server as your Method of Acquiring IP Address. This ensures that if you power cycle your modem it will still pick up an IP from your provider.
Hope this helps everybody