The i3 is a very small processing power in relation to the actual demand for Win10, even though it can work.
The drivers for the WiFi networking of the Laptop may be the issue. If you can see if you can install the drivers. Being DELL, it may not be a separate disk or thumb drive as like most desktop computers have. An easy work around is to buy a generic USB WiFi adapter. I bought the D-Link and installed the software that came with it. These are not expensive. Then I had no issue to use my computer wireless. I was having issues using the built in wireless WiFi with some types of programs. I am using Win7.