Hello, I have bought a new Dell Studio XPS Desktop 435T and installed Windows 7 64-Bit Operating system on it. My problem is everything else is working except my sound card. I have a Realtek Audio Driver A00 and have installed the latest driver from the Realtek's site. Now I am having problems with the center speaker and the bass of my speaker which sometimes gives sound and sometimes doesnt. I have also contacted realtek support but it is of no use. How do I get this thing to working can anyone help me out, thank you.