Laptop speakers are usually awful anyway.
I'd start by reinstalling or updating the sound driver.
I've become very fond of headphones over the years-connect a set and see if the problem goes away, which would tell you if it's the speakers or the software causing the problem.
External speakers are cheap and might help also.
A forum community dedicated to tech experts and enthusiasts. Come join the discussion about articles, computer security, Mac, Microsoft, Linux, hardware, networking, gaming, reviews, accessories, and more!