Here are some solutions via my MVP channels.
Something happened with the download and you need to reset
Resolution:
http://blogs.technet.com/b/ouc1too/archive/2013/10/25/something-happened-in-the-install-of-windows-8-1-can-t-be-completed-and-now-you-re-annoyed.aspx
Can't move your user folders
Resolution
Now blocked from the 8.1
http://answers.microsoft.com/en-us/windows/forum/windows8_1-windows_install/sorry-it-looks-like-this-pc-cant-run-windows-81/84310e8a-edd3-48d7-af31-0b09666b0c74
Biggest views:
http://answers.microsoft.com/en-us/windows/forum/windows8_1-windows_install/couldnt-update-to-windows-81-0xc1900101-0x40017/e1ee316f-f912-43ef-92dc-ee31a5fe62d9
Driver issue?
SSD issue?
http://answers.microsoft.com/en-us/windows/forum/windows8_1-windows_install/we-couldnt-update-the-system-reserved-partition/a5003ebb-1f3f-40e5-9603-bdcc21d6b6eb
corruption?
Not enough system space?
Daniel 😉
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