looking to fix my acer aspire 5515

iam using windows 7 home premium.i am not to computer savy so i do not know what or how to see if i have audio drivers installed PLEASE HELP THANK YOU

 
Alright to ensure you have drivers installed is simple on windows 7.

First click start(the flag in the bottom left corner)

Then click in the little searchbox and type windows update.

Now click check for updates in the left side. If any come up install them.(all except for the stupid bing toolbar installer)

Let me know if you have issues.