The Windows 10 that was forced on me is so bloated it has no performance and updates will not work - can I get 8?

I am using Asus T200A which is a lightweight PC/Tablet

Windows is 10.0.16299 Build 16299

There are too many problems to list

The system has got so slow and bloated with Windows software with less tha a Gig left on my C: drive, that when I want to open a new application, I have to close down the application I am using,  clean everything possible out of system and then sometimes restart (20 minutes +)

Screen rotation has disappeared

The final straw is that for the last few weeks every time I try to restart my PC it tries to install KB4338825

This is the process :-

RESTARTING

after  around  90 seconds    “Getting Windows Ready    Don’t turn off your computer”

after around   10 minutes    “Restarting”

after a few minutes  I can select Windows 10

“Scanning and repairung drive (:c)”

after another 5 minutes

PC restarts

“Getting Windows ready    Don’t turn off you computer”

When Windows starts again

Windows Update states  “Update status     -   Your device is up to date”

BUT  if I select check for updates  I get  -

Updates are available

‘”2018-07 Cumaltive Update for Windows 10 Version 1709 for x86-based Systems (KB4338825)”

Status: Installing  [    starts at 0   reaches 100%   ]

then  Status: awaiting restart

If I select ‘resart’   then the whole process starts over  -    another 20 minutes or so

Update History reports 0x80073712  - file needed by Windows Update is damaged or missing

Ran Troubleshooter    -  results Potential Windows Update Database error detected

Ran sfc /scannow     -    Windows Protection did not find any integrity violations

:\WINDOWS\system32>DISM.exe /Online /Cleanup-image /Restorehealth

Deployment Image Servicing and Management tool

Version: 10.0.16299.15

Image Version: 10.0.16299.492

[===========================83.7%================          ]

Error: 0x800f081f

The source files could not be found.

Use the "Source" option to specify the location of the files that are required to restore the feature. For more information on specifying a source location, see http://go.microsoft.com/fwlink/?LinkId=243077.

The DISM log file can be found at C:\WINDOWS\Logs\DISM\dism.log

and then ……

C:\WINDOWS\system32>DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:C:\RepairSource\Windows /LimitAccess

Deployment Image Servicing and Management tool

Version: 10.0.16299.15

Image Version: 10.0.16299.492

[===========================83.7%================          ]

Error: 0x800f081f

The source files could not be found.

Use the "Source" option to specify the location of the files that are required to restore the feature. For more information on specifying a source location, see http://go.microsoft.com/fwlink/?LinkId=243077.

The T200A has 32 Gig C: drive, a 500 Gig iwhen attached to base station and any numer of external usb drives from 14 gig t0 10Tb

Even with everything possible moved off the C: drive there is only around 800 Mb to 1.5 Gig left

I have spent too many hours trying to get windows 10 to work on this PC

I would have loaded Linux in preference to this useless system BUT there are programmes I need to run that will only work under windows

Is  there

1)   a way to use another drive for the system

or 2) A light version of windows 10

or 3) a way of deleting all of the bloatware  (X-Box, Microsoft Edge, Grove Music, Maps  etc, etc) to free up space

If not, please give me instructions on how  to return to  Windows 8 that was working perfectly( I was forced onto Windows 10)