Microsoft is testing a fix for Windows 8.1 upgrade woes
 

There are many Windows 8 and RT users who want to upgrade to Windows 8.1 and RT 8.1, but can't; a glitch has kept a seemingly random batch of PCs from installing this latest revision through the Windows Store. Thankfully, relief is in sight....

http://www.engadget.com/2014/07/01/m...=rss_truncated