WRT120N - Can't connect to Admin Console

I was trying to get into my router to give it a reboot yesterday, but was unable to get into the console. I used the username/password I've used for over a year (it was also auto saved) but it would not let me in. I went through all the steps to do a hard reset/restore default settings and it wouldn't let me. I had to access the boot loader to reload firmware, and that worked out just fine.

Now, I still cannot get access to the administration console with the default username (blank) and password (admin). I've tried moving my PC to ports 1-4 and none work.

I was about to give up on the router but I tried connecting from my iPhone and everything works just fine. I was even able to change my SSID and WPA key again.

Would this be a hardware issue, or could there be something in Windows 7 that's affecting it? I have disabled the windows firewall and AVG and still can't get any access from either Firefox or IE.

A couple of times I was able to get onto the first page of the console through IE, but if i tried clicking anything else it would ask for the username/password again and not connect. Now it won't even let me in once.