Can't connect to Wi Fi in Windows 10

I've had Windows 10 on my Dell XPS Studio laptop for a about a year, and suddenly I was dropped from my wireless Wi Fi connections. I've tried fixes in command prompt, resetting, uninstalling / installing network adapter, resetting router, resetting the network to name a few, none of which has worked permanently. On occasion I could get back on only to be dropped again.
When running the troubleshooter, it usually tries to reset the network adapter. Sometimes it suggests powering off/on the access point, or saying I've not selected a preferred network.
So, as of now
I cannot select a preferred network (though local networks show up when clicking on the Wi Fi icon.
When trying to select a network, the "up to 90 sec to show unconfigured networks pop-up window
does not reveal any.
Yesterday on a couple of occasions when trying different fixes, I was able to select my preferred wireless network and get it to show in the "View Your Active Networks" and I could connect without problem, but then I would be dropped again. What the root cause of preventing an active network from appearing is, I don't know.
Anyone any ideas I havn't tried yet, (short of resetting the PC or performing a clean install)

Note: I also tried rolling back a week or two using System Restore, but I got an error message saying it was
unable to complete the task.

Presently, the Wi Fi icon shows the asterisk at the top left of it.

Thanks

Have you tried changing the channel on your WiFi router? You may have other routers stomping on your signal.

IndieP said:

Note: I also tried rolling back a week or two using System Restore, but I got an error message saying it was
unable to complete the task.

Known issue, unrelated to your problem. No satisfactory fix yet, we await one from Microsoft. In the mean time, making a system image is the more reliable way to restore your system to an earlier state.
System Restore fails: AppxStaging %ProgramFiles%\WindowsApp 0x80070091

wyldman68 said:

Have you tried changing the channel on your WiFi router? You may have other routers stomping on your signal.

If it just started recently a neighbour may have just set up a new router. This little utility from Nirsoft lets you see the channels in use around you so you can choose one with the least interference from your neighbours.
http://www.nirsoft.net/utils/wifi_information_view.html

Regarding changing the channel on the router, my wife's laptop with Windows 10 does not have a problem. Also, I have this problem when at McDonalds (and I go their several times a week), so its unsightly to be a channel issue. I've tried a few other things since my last post, but have yet to look into checking to see if the router and my computer are using the same security type.