oh right i see. It is a black edition and it is a sandisk but yeha is a 10 so I'll upgrade that as well. the thing thats getting me is yeah, my computer does suck so is more than likly the cause, but some videos work in 4k and some videos dont work in 4k. If 720 worked and 1080 and 4 k didnt i would know the problem but its vedeos of the same size and waulity soem work some dont. maybe there currupt? but how? Nothing different was doen to the settings - saving or downloading of the vids. Well new computer and a decent card should do the trick. a speed 10 sandisk was fine for vids on my cannon slr (1D) so I just expected a go pro would be ok as well.
XCheers for all your help and sugestions guys! :blues: