Big Mess Up

My boyfriend was on my computer the other day, and saw that I had only something like 1.23MB left on my computer due to all of the programs I have. So, I decided to uninstall some stuff to make more room… Accidentally, I uninstalled SoundMAX from my computer (It makes my speakers work) and I tried to re-download it and it won’t seem to work. How can I get my speakers to work again?