Windows 10 Update Error C1900101

I received a C1900101-40017 failure error according to the update log when trying to update from Windows 7 SP 1 to the production version of Windows 10 Home. As far as I have been able to determine Microsoft has no online answer to what this error is or what it means.

I tried the update on an hp G62 Notebook PC, Product number: LD643AV, running Windows 7 Home Premium 64-bit Service Pack 1. It is supposed to be compatible with Windows 10 according to Microsoft specs. So why does it have problems with the upgrade. I think that I will attend next years Microsoft stockholders meeting to see if Mr. Nadella has some answers for why the problems after all the testing. In the meantime, I will be happy that after the failed installation of Windows 10, the software successfully rolled the OS back to Windows 7 and appears to be working okay so far. I sure as heck am not going to update my other hp PCs.

Hi,

Thank you for your interest in using Windows 10.

Refer to the following link and check if that helps you.

How to Upgrade to Windows 10 Using the Alternative Method: http://answers.microsoft.com/en-us/windows/wiki/windows_10-windows_install/how-to-upgrade-to-windows-10-using-the-alternative/541a0750-4571-4099-86d5-273a96a87618

Hope this information helps you. Please do let us know if you need further assistance.

For what it's worth, I had the same problem on my own HP ProBook with an i7 CPU and 16 GB of RAM, running Windows 8.1 Pro 64-bit.

Windows 10 was very insistent in attempting to download and install, even after I had unchecked its box in the available updates listing. I finally had to hide the update to get some peace.

For now, the thing I am least likely to do is to update any of my computers to this version of Windows. Here's the money question: How long will my copy of Windows 8.1 be supported with security updates? I couldn't care less about feature updates.

I thank you for attempting to solve the, problem, but for me it keeps giving that error code, and if this is any use to you, says that it failed during the second boot. Not sure if that helps or not. I'm tempted to try a clean install, but I have no clue if entering in my windows 8.1 pro activation code would work for the windows 10 pro activation. Any help for either the reboot problem or whether a clean install would help?

A clean install of Windows 10 will prompt you for a Windows 10 activation code, which you won't have unless you had successfully upgraded to Windows 10.  It's a chicken-and-egg problem.  I'm in the same boat, with the C1900101 error code.

Yeah. Best types of problems. Though I have found that if you install on a separate partition you can install. Maybe if you transfer the activation file it will work? Not sure if thats even permitted, probably should wait for the microsoft specialist to say whether we can or not. Can't test it at the moment anyways, I'll be away from my PC for about a week. But that might be a quick fix if it is allowed.

I used this tool ganesh says I mad a boot usb drive and update well i was in Windows the fist 2 time I try I got the same error then I try with out download update for the installation that work great. So the problem is in downloading update for the update So If you still get this error don't update with Windows update or update the installation during setup of update of Windows 10. Also I reinstall Windows 8.1 fist to take everything off my pc just in case I had to had to make a new recovery image wich I did. you might want to check if your recovery is set up as mine was not and had to make a new recovery image. BACK UP ALL YOU DATA YOU WANT TO KEEP

Thanks, Ganesh, but I'm afraid the update fails on reboot.

I'm thinking that the best thing for MS to do would be to allow us to generate W10 keys with our present W7/W8 keys and to let us then do our own fresh installs.  The update system is unfortunately unreliable for a number of users.

Did not work for me / I'm upgrading from win 8.1 Pro / and I still got C1900101-40017 error without avast or anyelse

If the update fails on boot it will just restore you Old Windows also i dont know if you know this you can maker a copy of your partition with thé Windows on and save it as a wim file. The best thing is to back up your Windows fist then you will keep everything anyway  look it up on Google make a Windows wim file if you need a Windows8.1 pe disk I can copy mine for you