Hi Heaven Bunny,
The other comment you posted had endings in it so I had to remove it, sorry about that.
But as far as the videos not working, I've talked to the programmers and the only thing they can think of is if it's an old enough laptop it might not have the codecs to play videos that have been used to encode the video. It's going to be a tough one to hunt down and fix.
Feel free to message me on Discord Whitehand#3403 with any other information or replications of the problem.