Is the error code0xC1900101-0x30018 or0xC190010-0x30018?
If the error code is 0xC1900101-0x30018, then you need to make sure all the drivers which are installed on the computer are up to date. Then go ahead and perform a Windows 8.1 upgrade and check if it gets updated.
a. Press Windows + R.
b. In the run prompt type Control panel.
c. Click on System and security.
d. Click on Windows update.
e. Click on change settings.
f. Under Impotent updates make sure you have selected "Install updates automatically (recommended) is selected.
g. Click on OK.
Do get back and let us know the status of the issue, I will be glad to help you further. We, at Microsoft strive towards excellence.
Your recommendation sounds so simple. Unfortunately for me and hundreds of other people it does not work. In my case all Windows updates have been installed. Update Assistant tells me all is good to go. And yet, I still get the error.
I know that other people have removed hardware and uninstalled software in order to get the Windows to update. However, it all seems very random and I refuse to dismantle my computer just to upgrade to this dodgy release.
Why can't the system let us know exactly what is causing the failure? Why does it have to be so hit and miss? Why do I have to have a computer science degree in order to upgrade to 8.1?