Lenovo B575 problem with playback?

So, about a month ago, my laptop quit working, would get stuck at the startup screen, so I took it to our local computer repair shop, and they informed me that my hard drive was fried. So, they replaced my hard drive with a slightly better one.

Ever since I had gotten my computer back, it doesn't do well with video and audio playback, it skips and freezes while playing videos, and with audio-only playback, it makes a buzzing sound occasionally during the audio clip… (also does this to the audio during video playback)

Running windows 7
uses the AMD VISION engine for graphics

The same thing happened on some of the laptops at my school. The admins set a password and shut the volume off