command prompt keeps popping up and minimises my games when it happens

Hey guy's.first time poster,but this little problem i'm having is annoying,to say the least.Every now and then the command prompt screen flashes up.not so much of a problem when im just on the internet,but it's problematic when i start playing games in full screen.Was gonna start doing some play through vids,but as soon as the command prompt flashes up,it kicks me off the game and onto desktop.I can't read what the command prompt says as it's gone faster than it appears.ive scanned with anti-virus,malwarebytes,windows defender,rkill and sfc /scannow.Nothing.no malware or virus'.i've updated all my drivers and the problem persists.Anyone else having this problem and know of a solution?many thank's in advance

I'm surprised this is not a sticky on many forums as I've seen it come up over and over.

Known issue with Microsoft Office:

• First you’ll need to open the Task Scheduler app as an administrator. Just simply search for the same using Cortana and right-click the app and select ‘Run as administrator’ option
• On the left, expand the Task Schedule Library option, followed by Microsoft and then select Office.
• On tapping the Office option, you’ll notice certain options pop up on the right. Right-click on ‘OfficeBackgroundTaskHandlerRegistration’ and do the necessary — hit ‘disable’

i don't have office,but i spoke to a guy i'm subbed to on youtube..i used crap cleaner and stopped background processers and sceduled tasks....and it worked

thank's for the replies,guys...much love