A bit of a background (I'm not sure if this helps):
I upgraded to Windows 10 last year. Found some annoying bugs with the apps but, overall, the OS worked fine I encountered no problems. I decided to go back to Windows 8.1 since the buggy apps annoyed me.
Just yesterday, I decided to go back and re-upgrade to Windows 10. First thing that happened is that explorer.exe kept refreshing causing this flickering taskbar.

I decided to use the other account on the same laptop. It worked. So maybe, only the other account was corrupted? I am not sure. So I used this account to search the solutions.

I searched for the whole day yesterday and did all the solutions from others. I removed my antiviruses, anything Apple, IDT Audio, and did my scans, and tampered with services. I did everything on this site said:

what Srinidhi Arekal said. I tried it all except the Norton parts. I didn't have any Norton.

Right now, I checked event viewer. I saw this. searched for it but can't find any solutions to it. Any ideas?

Faulting application name: explorer.exe, version: 10.0.10586.306, time stamp: 0x571af645
Faulting module name: wpncore.dll, version: 10.0.10586.17, time stamp: 0x56518abb
Exception code: 0xc0000409
Fault offset: 0x000000000002a886
Faulting process id: 0xbf8
Faulting application start time: 0x01d1c1e0ae8df2ed
Faulting application path: C:\WINDOWS\explorer.exe
Faulting module path: C:\WINDOWS\System32\wpncore.dll
Report Id: 926e7291-5d90-4913-8358-e8e1597a0dde
Faulting package full name:
Faulting package-relative application ID: