Let us know if a you see the same issue with a different browser.
Also clear the IE broswer cache, close IE then restart it and try again.
Odd how WiFi connects correctly however the LAN PC doesn't.
It's possible something is bad on the router.
One thing I though of, if you can get another PC to connect to it wired, a known working one. I might do the following:
Factory reset.
Reload FW.
Factory reset 2nd time.
Test.