Windows 8.1 Update Error Code: 0x80240031

I went through 2 new computers trying to get win 8 to work.  I gave up, trashed the Lenovos (i7, 1tb 5400 hd, 16 gig ram), and got a dell optiplex with win 7 64, 250 gig ssd, and 500 gig hybrid and 16 gig ram.  

Reality...win 8 sucks

win 7 is solid

an ssd hard drive is what makes computing what we all fantasize it should be.  I am finally working at my speed as opposed to my computer's speed.  It's an amazing experience...Highly recommend it :)

How do you do that?   Cablevision modem?

Turning off Defender & Norton 360 did not work.  Settting firewall to wide open did not work.  Doing all updates first did not work  especially since I can't get the Office 2010 service pack 2 to install either but everything else did install.

Cmon.  Microsoft does not know how to fix this 6 weeks after the above reply was posted?

Thank you, did some checking found out the modem from internet service I am using not updated to Win 8.1

So now I what one week to see if device gets updated or internet service will swap out to new modem to one ready for 8.1.   In closing for others make sure drivers from your internet service are Win 8.1 ready.

I had faced this problem and I had contacted with Microsoft customer care and sony vaio but unfortunately no one able to fixed this error

suddenly one option clicked in my mind  and I took another internet service provider's modem from my friend and tried to download windows 8.1 surprisingly download started I was too happy but the downloading was too slower than my internet provider so after so much  irritation from speed I disconnected internet and put back my own modem and connected to internet and tried to download windows 8.1 and interestingly my downloading started from where I left downloading,

so I would like to advice try with another internet service provide, all the best