Random "cmd exe......" popping up

Not sure when this actually started but curious as to why it did? It will occasionally pop up while I'm reading online, but it disappears so fast I can't read all that it says. (something like cmd exe system 32). Haven't noticed any interference with anything other than it's just annoying!lol It also shows up as a (dark) blank screen when I initially connect to the internet. Happens pretty quick but doesn't say anything. Not sure if that's related to the cmd popup??
I've done a Malwarebytes scan, but nothing showed up there.
Old lady here, so limited understanding on how computers work!lol Hope someone can help explain this to me & how to possibly rectify it!

 

Hit the PRINT SCREEN (prt sc sysrq) Key and paste it like in Word or even in an email and read it.