"Couldn't update to Windows 8.1 - 0xC1900101 - 0x40017"

i have this problem too . 

but i cannot have any ideea for resolve that . 

can you help me ?

I think you haven't undertood the problem, most of the people having this problem, me included, are having this issue on new hardware and free of any software and driver that could give problem...snip       

I do understand. Most of the time when I see these problems, it is on new machines that people built. Did you check all the hardware against the MS 8.0 compatibility list? Did all the hardware and drivers have the holographic tag certifying that it has passed the MS certification? Did you check the partitioning of the new drives to see if they were NTFS compliant, or, were they preformatted at the factory on a Linux based mass formatting production rig? (I can't tell you how many times I've been bitten by that.)

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The issue is not WHAT third party software you installed. It is WHAT that software DID to the OS.

Third parry programs that modify the OS, like ones that replace the start menu, add AERO, remove the charms, removed Metro, or replace the built in security with old antivirus programs designed for other operating systems, then the resulting OS becomes a mishmash.

You are no longer running Microsoft Windows, instead, you are running Mishmash Windows.

I bought a 7" Toshiba tablet through the MS store. They sell the exact same hardware at the exact same price as the identical model from Toshiba. Microsoft calls it a Signature Edition, Which means it comes without all the shovelware that Toshiba put on the same identical tablet. I upgraded it to 8.1, the upgrade went without a hitch and was done about 3 hours after taking it out of the box.

I got the MS Signature Edition because I had purchased the exact same tablet from Toshiba two weeks earlier and spent nealy all my time with tech support trying to get it to upgrade. The first problem we found was that the shovelware antivirus had to be removed,  it prevented the Store from modifying the windows system. That got us farther into the upgrade. Then there was a helper app for the USB, a WiFi driver and a couple other things that were crashing the install, all a result of the shovelware that Toshiba installed. I didn't get the tablet from Toshiba working until a week after I had the Signature edition from MS upgraded. I did it by making a USB 8.0 install drive, doing a clean install of 8.0 from MS and then upgrading to 8.1. After all that, the upgrade went just like the Toshiba Signature Edition from the MS store.

Francesco, You are right when you say; "a big update like this should work independently of the software I've installed". That is true. However, If you have some rogue third party programs that modify the OS via registry hacks and such, or change the underlying drivers or even the disk structure, then you have a Frankenstein Zombie Alien OS,  (FZAos) and a update will not know what to do with it. The 8.1 update expects Windows 8.0, not OSX, PS3 or FZAos. Even then, only some updates will keep your existing programs, other times, you will need a transfer utility, then, you might have some programs that will need to be upgraded or are not supported.

Frankly, I am impressed that the upgrade successfully returns your system back to it's original 8.0 OS once it finds that your 8.0 copy has been zombiefied. It successfully presents you with the error message, "Can't be upgraded" and "Your OS has been restored to 8.0" but to expect it to know how your system got zombiefied is expecting the impossible. Frankly, I would not want the upgrade to be a 9 TB of download to handle every possible piece of **** the hardware vendors put on PC's . "Can't be upgraded" and "Your OS has been restored to 8.0" is pretty good compared to what most other OS's do.

Bye the way ,Francesco, I'm impressed that you managed to build a PC with all the latest stuff. I've built more than a thousand PC's for engineering firms, power plants, paper mills and othe businesses. For the most part I used tried and trusted components. If I changed to a new board, I often put it in several PC's and threw everything I could at it before I added it to my stable of components. Sometimes I spent weeks selecting something as simple as a disk controller. To build a new PC from all new versions of components takes some real skill, not to mention chutzpah.

Sorry to tell you, but Windows is actually a mishmash OS, it supports all kinds of hardware, and it's made this way, its success is based on this. Of course is not well optimized like MacOs, it couldn't be like this, but with the latest versions, 7 an 8, they made a great advance in automatic hardware and driver download, I installed windows on every kind of new and old pcs or notebooks, always working flawlessly. I'm happy that you're impressed by my skill in pc assembling, but it's not that difficult, now it's really easy with all the standardized component that work right outside of the box, and I pay them to be tested by the manufacturer, I don't have to do it, if there is a problem I get a new one under warranty, I don't understand what you mean by "trusted" and "stable", to me they doesn't make any sense. And by the way this is a simple pc I use in my tv room hooked up to the television, I don't have to use to run nuclear power plant or other similar

Dig out the system logs?  What are we, system programmers?  That's what MS should be doing.

When MS connect to people remotely I imagine that they will do something like that to understand the symptoms.  In this forum we are discussing self-support techniques, so instead of just bleating about the useless clue being seen I think eventually someone who is interested enough will have to do just that:  find supplemental clues.  When that happens hopefully they will share whatever they learn and maybe even encourage some of the less adventurous to look at the same sources for their specific clues.

Dig out the system logs?  What are we, system programmers?  That's what MS should be doing.  Reading through system logs to perform what should be a straight forward update is beyond reason for the non-technical user.  And as you probably know, the system logs can be misleading and in many cases, are only a starting point to possibly finding answers.

This is not a good recommendation for most users.  If it was all that simple, this problem would have been solved a good while ago.

David B.

 done everything suggested

I don't think so.

http://answers.microsoft.com/en-us/windows/forum/windows8_1-windows_install/couldnt-update-to-windows-81-0xc1900101-0x40017/e1ee316f-f912-43ef-92dc-ee31a5fe62d9?page=82&msgId=c72aeafa-b192-4bb8-b1e5-cf20270016fa

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You need to dig out the logs. 

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