Video Issues

Hi There,
I can be happily working along, and if I need to see a video file, I can... but then, sometimes it stops, and I cannot make the video work again.
I have Driver Updater, but if I reboot the computer, the video function will work again.
Sometimes, if I run a BoostSpeed scan, the video might work again. It can still stop again, but if I Boost Speed again, it may not make the video run again.
So I have to reboot again instead, which is pretty time consuming.
My initial thought is I'm missing video drivers, but i have Driver Updater.
Can you advise and help me?

Bonjour,
Suite à des modifications de BootSpeed, la webcam de mon ASUS VivoBook Pro 17 N705FD ne fonctionne plus.
Elle a commencé à se mettre en 4/6, puis elle est maintenant déconnectée !
J'ai désinstallé le programme et coché l'option "restaurer les changements éffectués", mais cela n'a pas résolu le problème.
Best regards,
loupherv