Sounds like this could be a PC, ISP modem and router issue here.
- What ISP Modem Mfr. and model # do you have?
Try the following, disconnect the cable from the ISP modem and use the one pc to gain access to the router and can you configure the router with out it being connected to the ISP modem?
3rd Party Security Software Configurations- Turn off all anti virus and firewall programs on PC while testing. 3rd party firewalls are not generally needed when using routers as they are effective on blocking malicious inbound traffic.
What browser are you using?
Try Opera or FF? If IE 8 or 9, set compatibility mode and test again. Happen with any of these browsers?
Try turning off these features in Chrome: Top right corner, little bars for options > Settings > Settings (on left) > Show advanced settings.
Uncheck these:Use a web service to help resolve navigation errors
Use a prediction service to help complete searches and URLs typed in the address bar
Predict network actions to improve page load performance
Enable phishing and malware protection