Hi Denise,

Firstly, we need to establish what might be causing the flickering screen. To do this, open up Task Manager by pressing Ctrl + Shift + Esc simultaneously. Alternatively, right-click on your taskbar and then select Task Manager. We don’t actually need to use Task Manager, but we do need it open.

Now, watch your screen to see if Task Manager flickers. If you find that everything on the screen except Task Manager flickers, the problem is likely being caused by an application. On the other hand, if Task Manager does flicker (along with the rest of the screen), it’s probably a display driver that’s causing the problem.

Three applications have been identified by Microsoft to be causing problems: Norton AntiVirus, iCloud, and IDT Audio. While it is possible that other programs are also being troublemakers, these are those that are known to be consistently creating a flickering screen.
In the case of Norton AntiVirus, the problem has been acknowledged by developer Symantec and they’ve released a specific fix for it. If you’re running Norton, head to their official support page and follow the steps (which involves downloading a fix .exe) to resolve the issue. It should work, but keep reading if not.

Across all three applications, make sure you’re running the latest versions. Either update within the app itself or head to the respective official websites and download the most up-to-date release. You may find that this issue has now been officially patched within the app.
If this doesn’t work, it’s time to try uninstalling the program. To do so, press Win Key + I to open Settings. From here, select System and then App & features from the left-hand navigation. You’ll then be presented with a list of all the apps on your system. Find the offending app, left-click it and then click Uninstall. You may need to restart your system for the changes to fully take effect.

I hope this helps.
Regards,
Lokesh