You don't seem to be using this Connection, but a second one.
There's very probably a second connection with correct parameters in your ipconfig output.
You're either connected by WIFI or a second network adapter.
As for the "Internet Explorer cannot display the webpage", if Firefox works, why bother
More seriously, check that internet explorer is not set to work offline, and whether there's a proxy configured.
To do that :
Open the 'Tools' menu, click on 'Internet options'
Then go to the 'Connections' tab, then click on 'LAN settings'
Compare with the corresponding options in Firefox :
'Tools' menu, hit 'Options', click on 'Advanced', select the 'Network tab', click on 'Settings'.
If you see any difference, try and apply the settings you see in Firefox to IE.