Need Computer Expertise

[u84]

So, I got a brand new laptop about a year ago, an hp ProBook with intel Core i3, Windows 7 and an on-board graphics card. About 4 months ago, something went askew. Whenever I play a movie, a song or any game with sound (aka FFR), the whole computer jerks every 30 seconds or so. It's difficult to explain, but for instance: playing FFR. I will go along fine for a bit and then this jerking happens, the speakers make the sound they'd make if your song froze in the middle (I hope that makes sense) and basically the whole song is delayed a couple fractions of a second. It makes playing FFR impossible. Does anyone have any idea how to combat this?

TL;DR: My sound and any game with it gets delayed a fraction of a second once in a while and I can't fix it.