Choppy Audio when using DVD/CD

Hi ..
Newbie again

I have put together the following PC but everytime I acess either DVD whatever Audio is being heard (VOIP/MP3's etc) gets very choppy.

I have changed Audio to the on-board RealTek 8ch and upgraded drivers

Also change one of the DVD to an NEC2500 from my old system which worked all ok

I guess there is some sort of DMA / IRQ clash from the new Mobo and the audio but I just don't know where to start..

Sorry for being such a Noob !!!

Please help

The Godson (Stef)

Mobo: MSI 7246 Ver 2.1 975X Power Up Edition
BIOS: Phoenix Technologies - Award Ver 7.20 09/21/2006
CPU: Intel Duo Core E6700 2.67 Ghz
RAM: 2 x 1Gb OC PC2 6400 OCZ2SOE8002GK
PSU: Enermax - Liberty 620W
HD1: ST340810A (40.02 GB) IDE
HD2: ST3500630AS (500.11 GB) SATA
DVD RW: 2 x Optiarc DVD RW AD-7173A
Case: Thermaltake with 3 fans
OS: XP Pro - SP2 (using IE 6)
AUDIO: RealTek ALC882M - NOV 2006 Drivers

 

Eveerset Specification Report attched ..hope it helps