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Note that the answer accepted for this problem appears to only be applicable to systems using some form of full disk encryption.
I just tried to install windows 8.1 on my laptop, but it fails to install with the message:
Sorry we couldn't complete the update to Windows 8.1.
We restored your previous version of Windows to this PC
0xC1900101 - 0x20017
The update installed just fine on my desktop. The difference between the two machines is that the desktop has media center install, and isn't using TrueCrypt.
On the first reboot for the update, the laptop goes to the PC restore screen. Thus far I have just been selecting "Continue to windows 8."
Full WindowsUpdate.log http://pastebin.com/hGmAW4Q1
Update: Turns out it was TrueCrypt! I decrypted the drive, installed Windows 8.1, and then re-encrypted the drive and it worked just fine.
Could you post a screenshot of your system properties removing any personal information before you do so? Are you using full disk encryption by chance on the laptop? – Ramhound – 2013-10-17T16:57:05.560
1I googled something which sugested to browse to the
C:\Windows
directory and look for a file namedWindowsUpdate.log
. Search for the code "0xC1900101" to see if there is any indication of what the updater was doing at the time the code was logged. – horatio – 2013-10-17T17:00:52.1501I am using full disk encryption, provided by TrueCrypt. According to Microsoft, TrueCrypt 7.1 is compatible with Windows 8.1. – cmorse – 2013-10-17T17:01:03.433
1you should decrypt the HDD before doing the update. – magicandre1981 – 2013-10-17T17:34:26.883
@magicandre1981 I'd like to avoid having to decrypt the HDD if possible. It would take 3 hours to decrypt and another 3 to encrypt it again...and I don't see any reason why I shouldn't be able to perform this update with full disk encryption enabled. – cmorse – 2013-10-17T17:42:36.163
@cmorse I'm in the exact same spot as you, what did you do? – flindeberg – 2013-10-18T08:30:43.640
1@cmorse I decrypted my truecrypt encrypted boot-partition, updated to 8.1, and now I'm encrypting my boot partition again (I have multiple partitions, but only touched the boot/windows one) – flindeberg – 2013-10-18T13:36:36.470
It would seem there are myriad reasons why this error can happen. There is by no means a guarantee that decrypting your drive would enable you to bypass this problem. How do I know? I'm having the same problem myself, and I'm not using encryption. – Michael Grant – 2013-10-18T20:18:36.373