Stupid screen

hi the question i asked yesterday was not solved sorry. my laptop is windows 7 and it is a widescreen laptop, on most stuff the screen is normal but when i go on games or youtube for e.g, the screen has black panels down the side of the youtube video but not on the whloe screen just the youtube video screen and i think it is because the laptop is widescreen and not a 4.3 normal sreen, so if any one could help me with this please because it is really annoying me. thanks i hope i explained the problem right.