No AUDIO!!

Hello today,
Well a couple of days back i lost all audio from my computer meaning even when i put the headphones on my speakers are working and all because i can hear a fuzzing noise even when no sound should be playing.
I was trying to delete things to make more space so i could make more room.
I guess i deleted Realtek.
Im not really sure how to get it back and which one to choose if there is one to re download.
please help thanks
Really frustrated from this computer.