Windows 8 won't update.

Elimination

I re-installed windows 8, did a fresh clean reformat but now when i run my PC windows update no longer...updates. It's active, and says its downloading and installing, but it actually isn't, it sits at 0% forever and never actually installs or updates. I've literally been at this problem all day and been trying everything, the windows update repair tool windows says to use also doesn't work, it just hangs and "Repairs" forever and never stops or fixes anything. Anyone else encounter this problem? I've been hunting around the net for a solution but nothing seems to be working, even manually updating isn't working because i dont know what updates to download from the site as MS makes it woefully unclear and there are no full update packages. I even did a SECOND reformat, and im still having this issue.

I'm at my wits end and have no idea how to fix this problem, any help would be fantastic.

Zilla360

Doesn't sound like an issue on your machine if re-formatting didn't fix it, perhaps the update servers are down? Only other thing I can think of it being is a router/ISP issue.

Elimination

We DID just change service providers....uncertain how that would effect windows update though since everything else is working fine, including other downloads, it's exclusively an issue with windows update.

Zilla360

Maybe BITS is blocked? AFAIK it uses UDP, though I don't know which ports.

http://en.wikipedia.org/wiki/Background_Intelligent_Transfer_Service

http://www.wsusoffline.net/

Elimination

Ok used SFC /scannow command and that worked but now I can't download the win 8.1 update from the stupid win store

Bendery It Like Beckham

specs?
manufactured or custom built?

Elimination

Apparently the 8.1 wont download unless all other updates for Win 8 have been installed, so it sorta fixed itself now. I dunno why it wasn't updating before, but scannow did detect corrupt files and it fixed them, after that the updates flowed. Microsofts update repair tool was super useless though which i suppose is not entirely shocking. For the record it was on a higher-end MSI laptop.