Starting about a month ago, after six to seven months of my laptop working fine, I've been getting video and audio stuttering whenever gaming or watching most HD videos and after messing around with my drivers I realized that whenever my Realtek HD Audio drivers are disabled my video runs flawlessly, but when enabled both video and audio stutter. I'm using a Sony VAIO laptop so I'm assuming that the sound card isn't easily replaceable. I've tried using the newest drivers straight from Realtek's website and also the outdated driver provided by Sony's website, both of which result in the same stuttering. Sony has also replaced the motherboard once and it did not resolve the issue. Any suggestions? I'm currently running Windows 7 with 6gb of RAM and an NVIDIA GeForce 330M graphics card.