Windows 10: fortnite causes greenscreen

everytime i launch fortnite it causes green screen. running latest version of windows 10 insider preview. ive tried running in compatibility mode to no avail. please help

:)

 

Fortnite

Click Start > scroll through the program list

Find Fortnite

Right click it then click uninstall

 

How to Install Greenscreen onto Movie Maker

I bought a new computer last year and installed the Windows Movie Maker app (I don't know if this is that different to the movie maker program??) before Jan 2017. But it seems really basic and I'd like to film some greenscreen but there is no transition
for greenscreen. This is a screenshot of the extent of what I get currently with movie maker:





Where are all the other features and how can I get greenscreen when it isn't already included here?

Thanks for your help!

 

Computer lags when I try to run Fortnite

Prior to the issue, I changed some settings on my computer to make fortnite run better (Fortnite ran fine for a week after I changed the settings). I dont think that it was that that caused the problem... I do have the latest patch for fortnite ( I reinstalled
Fortnite entirely and checked for updates). And I always update my device to the latest version. If you’re wondering what settings I changed, theres a youtube video about how to increase framerate in Fortnite by Panjno (the latest version). Thank you for
your quick response and i’ll enjoy hearing a reply.