Computer Memory

Yesterday my step-son has downloaded a game in my laptop and to be honest i was like grr..I was pissed off because the download takes 4 hours and i have a lot of better things to do with the laptop. So, instead of just waiting to the download, i decided to cancel because it also affecting the performance of my laptop. I can't open the browser so quick because of the damn download. I also ask husband about the computer memory because they says, it can boosts performance of the PC. And now, I'm shopping for laptop memory and looking for great deals here..Would probably get one, if i can find any good.