Win10 guest flickers continually in LL3.2 host (Oracle Virtualbox v 5.1.10)

[m654321]

Not sure what you have tried...
Sometime the Extension pack and/or the Guest Additions may help..
The Extension Pack is fairly easy to add; although they do have to match version for version - EP and VBox.. This is added via preferences and the extensions section (I believe)...
The guest additions are a bit different as the iso file is already within - Go to storage (add a controller if needed) then map a drive to the guestadditions.iso within the Oracle VBox folder (may need to search prior for location as I don't recall the exact Linux Path).
Once mapped lunch the guest additions app from with in the guest machine.
I know its fixed some graphic issues for XP and W7 so I assume the same W10...

Thanks firenice03..
I think I've already got the guest editions (to give full-screen view) & matching extension pack (to give connectivity to USB drive & host's HDD) already installed correctly, as these seem to be doing their intended jobs.
I had flicker problems & some sound (crackling) problems with Win8.1 too in VM:  for me only Win7 and WinXP behaved as they should in VM, i.e. flicker-free & good quality sound.  The reason I've ditched Win7 is because  I'm having problems with the monthly roll-up updates - they don't appear to be installing as they should...

Cheers
Mike