I'm having the exact same problem as the OP describes it, tried all of the above mentioned solutions and nothing worked for me.
(Though I don't get the "failure to connect" message, instead the whol page stays blank and IE tells me it's "done". Haha.)
Funny fact though, the router usually does work fine. As for now, it seems I cannot access Internet, network or the router IP via the hardwired computer, though the netbook has no problems at all, proven by the fact that I'm sitting here and typing this. So the WLAN seems to work... I really don't understand what's going on here, especialy since the computer where nothing seems to work has no problems to receive and send E-Mails via Outlook...?! (Otherwise I's assume that the cable is broken or whatever)
What I tried so far:
1) EVERY combination of unplugging cables and resetting devices that you could possibly imagine. Didn't work, the router set up is still unaccessible.
2) Sending a ping from the computer to the router, successfully. So the connection is there.
3) Sending an E-Mail from the computer. It is able to receive and send E-Mails without problem. However, anything else that requires Internet (such as anti virus software updates & msn) do not work
I'm kinda out of ideas here, so I'd appreciate some help.
I'm just glad that strangely the WLAN still works fine, otherwise I wouldn't even be able to ask this.
Also probably worth mentioning: the internet worked fine for a long while. But yesterday I accessed the network with my notebook (the the one I'm using right now) for the first time since about at month ago, and after about one hour spent without any excessive downloading whatsoever, the internet connection was suddenly gone and since then we have this problem here.
My mom already accused my laptop of "breaking the network/internet". Personally, I assume the router is broken. What do you think?