8.1 won't complete install

I have an Acer V3-571 (i5, 6GB ram, 500GB HDD, Win 8 pre-installed from new).
I have been trying all day to install 8.1 to no avail. 5 or 6 times.
It starts the install okay then near the end the install stops and gives an error code 0xC1900101 - 0xC3000D

.
And asks me to restart and reverts to Win 8.
One thing I have noticed is that the 'Windows software licence terms' box does not appear at any point.
Any idea guys/gals?

I forgot to mention I run 'Start is back' normally, but uninstalled it just in case.

No replies.

Please guys help, I've no idea!

Have you by any chance moved one or more of the systems file paths? For example have your User directory on a different drive.
I've been reading that everything needs to be where MS expects it to be to complete the install of 8.1
I also needed to install new graphics drivers and I disabled Windows Firewall and real time protection in Windows Defender.

Hi duckface, I haven't moved any system file paths. I will try the graphics drivers and security software items you have listed.
Many thanks.

Did you make the OEM manufacturer's Recovery Disks?