Sound is not coming from speakers

Hi Members, My problem is sound is not coming from speakers. I exactly do not remember, but before some days I tried to delete some programs to free the memory of my pc for better performance. I think, unfortunately, by mistake I have deleted realtek audio driver. after that, I have been trying to download and install the realtec audio drivers from various sites. But I can't resolve the problem. Actually, I don't know exactly which driver or software is required to get sound back.

Please, advice me to solve my problem.

Thanks.