An update in early January 2018 resulted in issues with onboard Graphics chips. In particular AMD HD 3000 chipsets. Updating to version 1709 would then prevent you rolling back the Graphics Driver so you would have had to have rolled back the driver before updating from Windows 10 version 1703 to 1709. The rogue update would then automatically install resulting in the resolution changing, large icons and windows not filling the screen etc.
I was unable to find a quick fix at the time and although Microsoft acknowledged the fault they were unable to give a resolution timescale, blaming AMD and vice versa.
I installed Graphics Cards into all computers which resolved this issue. Please note, the Windows update still tries to upgrade these cards but you can install the latest driver from AMD and then block any driver updates from Windows without permission.
Please note that this issue is completely separate from the Northbridge Error issue resulting in computer restarts or freezing.