I am also unable to download anything through IE10. Also I am not able to get my Microsoft ID recognized, so I can't download anything from the Store either. (the ID works fine to log into Outlook through the web interface, and on my Nokia 920, so I know
the account credentials are sound.)
I just upgraded from win7pro to win8 and then immediately to win8.1. Things were OK with win8, but now, an utter mess. File Explorer on the desktop side keeps crashing, my touch screen no longer works, and this inability to download anything makes all these
issues impossible to fix!
I have no anti virus software to disable. I've reset my firewall to defaults. I've checked active X settings in IE10/desktop side, run the sfc scan, and checked the system time, All for naught.