Can anyone fix my laptop audio problems?

Recently I had purchased a new laptop .The voice chat and audio recording are not getting connected properly. The voice is breaking and is very much disturbed. I tried with some other laptops and all of them are working perfectly. Following related recently occured problems with audio of my laptop...

1.Laptop has no audio
2.Laptop audio file missing
3.Audio recording is not working on laptop
4.Audio driver for laptop is missing how to download it
5.How to set audio input for laptop
6.Best audio output splitter for your laptop
7.Best laptop audio enhancer

Can anyone help me in resolving these problems?