Try following one by one for MSI computer. Skip a step which you have already tried.
A. Run Internet Connections / Network / Hardware & Devices Troubleshooters
Windows Key+I > Update & Security > Troubleshoot >
- Click Internet Connections > Run the Troubleshooter
- Click Network adapters > Run the Troubleshooter
- Click Hardware & Devices > Run the Troubleshooter
B. Run Built-in & Guided Walk through Windows Update troubleshooter
Built-in : Windows Key+X > Click Settings > Click Update & security > Click Troubleshoot > Click Windows Update > Click Run the Troubleshooter
Guided Walk though - https://support.microsoft.com/en-us/help/10164/...
C. Run SFC Scan & DISM
How to - https://answers.microsoft.com/thread/bc609315-d...
D. Head to following Microsoft Help Link and execute the steps there
After I did D) (above) I didn't get much joy from the WiFi internet speeds on the MSI laptop.
So I did more searching and several posts on other forums, and I have a possible explanation of why the MSI's internet speed tests were slower, and Windows 10 Pro 1803 needed additional tweaking in the settings.
Firstly, the MSI needed to have LSO and Windows Auto-Tuning Level disabled, which immediately improved the Ethernet internet speeds in the office (90 Mbps Down + 90 Mbps Up) and at home (85 Mbps Down + 7 Mbps Up) to accurately reflect what the speeds are on both these networks.
However the MSI's WiFi internet speed tests, using Intel(R) Dual Band Wireless-AC 3160 adapter, was still very sluggish compared to the Acer. The Intel WiFi card's specs can be found here:
https://ark.intel.com/products/75442/Intel-Dual-Band-Wireless-AC-3160
And the searches I did indicate that the Intel card is slightly crippled as a WiFi adapter, while being used on the specific networks that I am using.
One poster on another forum even said the following:
"Your solution seem to be pretty obvious: disable WiFi on Huawei and get a dual band ac WiFi access point with a LAN connection to the Huawei. I am very sorry, Intel is a crippled product, this is a cause."
And the above comment matches what he found on this forum post:
https://superuser.com/questions/1257599/why-do-i-have-such-a-low-wifi-speed
So I would think that this is all cleared up now, and at home I'll consider the recommendation above, and at the office I'll keep the MSI laptop on Ethernet only for faster internet speeds.