Sound problems with SWEPS

I’ve been having problems concerning SWEPS. SWEPS Such as the UMB Pack sweps no longer have any sound when firing, reloading, or drawing. Can someone provide some insight on this problem? I am Absolutely sure it is not my drivers.

I thought this was a GMod related problem.
As far as I know, all CS:S gunsounds don’t work anymore. I’ve seen this more, at my friends to.