It's an on board chipset. I first installed the version that shipped with MSI CD [Version Jan 20010] & after noticing the problem downloaded the R2.53 from Realtek site. But still the results were same. I have a ATI HDMI Audio driver also however I cannot test it yet. OS: Win7 64bit.
I have MSI 880GMA-E45 as the motherboard & have Realtek 6.0.1.6215 (R2.53) as my driver version which is the latest. While playing/testing no sound comes from my Left speaker & I just hear the bass. Earlier in XP they worked fine.