Help me!!! ++++k for everyone who helps!!!

hi guys so i was deleting programs from my computer ( because it was cluttered and had viruses) and i deleted some mysterious software by accident. now i realised that i have no sound at all! no icon to turn it up or down, when i plug headphones in it still doesnt work. please help me with some sound software, troubleshooting?? anything!, any legit links to some software would be appreciated. anyone who helps gets +++k and -k for being retarted :P