CSS and Mad Cow's CSS sweps not making any sounds

After installing CSS Realistic Weapons 4 and Mad Cow’s Swep Pack 3, I was hoping i would enjoy the noises of shooting and using the guns.

I was wrong.
Apperently, neither packs are using the sounds from the sound folder in Mad Cows Weapons/sound/weapons or in CSS Realitic sweps 4/sound/weapons. The Sounds are there, they’re just not being played.

Also, I’ve put together the sounds/weapons with the sounds folder, and theres no difference.
Help please?

Do you even have CS:S?