One of the most common errors encountered by Microsoft users upgrading from Windows 7 or Windows 8/8.1 to Windows 10 is the Error Code 0xc1900106. Microsoft users experience a failure in the installation process. Either they will be notified that the installation process was ended but failed or that Windows is not able to install the update.
Error CausesMore and more Windows users are having trouble upgrading their operating system to Windows 10. There are a lot of errors being encountered by users and one of them is the Error Code 0xc1900106. This error is normally due to the misconfigured system files. If a Windows user encounters this error, most likely their device has some registry problems.
Fixing error code-related issues could be best resolved to do manual repair methods. Applying repair methods manually can help Windows users address the root causes of the errors they encounter, as well as apply definite solutions to rectify the issue.
Most Windows users can be able to implement manual repair methods themselves but there are some cases where help from a Windows professional is needed. If you’re not a very tech-savvy person and not confident performing the manual repair methods yourself, it would be advisable to seek help from a professional Windows technician who is knowledgeable enough to address the errors or problems you are encountering. However, if you don’t want to resort to seeking help from a professional, you can also consider using a powerful automated tool.
In trying to fix Error Code 0xc1900106, here are the following manual repair methods you can take:
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C:WindowsSoftwareDistribution SoftwareDistribution.old
ren C:WindowsSystem32catroot2 catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
pause

Error Causes“An unknown error has occurred: Server error 421” "Could not send your message. Error 421" 421 4.2.1 : (DYN:T1) http://postmaster.info.aol.com/errors/421dynt1.html 421 4.3.1 Out of disk space for temp file 421 4.3.2 All server ports are busy 421 Downstream server error 421 Fork failed 421 Greylisting enabled, please try later “An unknown error has occurred. Subject ‘Testing’, Account: ‘pop.charter.net’, Server: ‘mail.charter.net’, Protocol: SMTP, Server Response: ’421 Message rejected’, Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67”
Error CausesSome users wanting to upgrade to Windows 10 from Windows 7 or Windows 8.1 experienced errors with installation. One of these errors is CPU Not Compatible. When you click and run the “Get Windows 10” from your system tray bar, you’ll receive the “CPU is not compatible with Windows 10” error. When this happens, it might be good to check if there’s a bug or if your NX feature (a requirement for the Windows 10 installation) is enabled.
Error CausesThe “CPU is not compatible with Windows 10” error normally occurs when:
To successfully upgrade to Windows 10, your CPU must support Physical Address Extension (PAE), SSE2, and NX features. If any of these features are not activated on your system, it’ll cause the CPU not compatible error. However, some users still reported experiencing this error even though their CPU has these features activated. Normally, this is due to the bug that Windows acknowledged.
If any of these two scenarios apply to your computer, the following methods will help you fix the problem:
The bug applies to some Windows 7 and Windows 8.1 systems. The bug occurs when the “Get Windows 10” app fails to recognize CPUs as being compatible. This produces a false negative result with a message, “Here’s why Windows 10 cannot be installed on this PC: The CPU isn’t supported”. To fix this bug, Microsoft released an update.
Unfortunately, the patch update (KB2976978 for Windows 8/8.1 and KB2952664 for Windows 7 SP1) to fix the bug may not be automatically downloaded to your computer. If this is the case, you need to verify first if the patch was installed correctly. To do this, follow the steps below:
A major requirement for Windows 10 upgrade is for the CPU to have Physical Address Extension (PAE), SSE2, and NX features enabled on your system. If you receive the CPU not compatible error, one possible cause is that any of the mentioned features are not available OR not enabled on your system. Here’s how you can fix this:
If changing the settings in your BIOS doesn’t do the trick, your final option is to force enable the NX bit in your Windows system. However, this is only applicable IF and ONLY IF your CPU does support it. To force enable NX bit, do the following:
Error C00D11B1:’Windows Media Player can’t play the file.’
Error Causes