Is that folk will install Windows but not the 10 or so drivers and helper apps. As this is a custom PC your install must be custom and the builder provides the install routine for Windows.
It's far from automatic and some items will have folk swearing for years. I can't tell much from your story but it sounds just like the others.
Sorry I can't be more specific but the maker of this thing is the person to talk to.
Example of driver hell follows.
Hi cnet forum
I recently built my first PC but I have been having major issues with internet speed. I browsed through the forums and, as a result, updated my LAN driver with the latest driver for the Intel LAN Driver V18.104.22.168
I have the virgin media super hub with up to 60mbps download but rarely get over 20 and even then the download of webpages seems glitchy... on evenings it is terrible with 0.5 to 1.5mbps being the norm.
The problem is also affecting Chrome which struggles to render maps and stream videos such as 720p videos on youtube even when I have a tested connection of 30ish. I usually resort to using Explorer, reducing videos to 360p or even 240p.
I've reinstalled Chrome a few times but still no change.
What is going on??
I also have an old Dell Inspiron laptop which works brilliantly with the fast internet - where the speed of the hardware is the only limiting factor.
I've looked through the forums and have found people with similar issues but still can't get the problem fixed.
Can anyone help explain the poor speed of my PC compared to my old laptop?