Windows 7: Disable/Modify System Shared Memory

Let me preface this by stating I am a DJ who uses his PC as a tool to play music from. This being said, audio performance is a priority to me.

With that said, here is a quick list of my setup:
Intel Core 2 Duo T7200 ( 2 x 2Ghz)
3 GB DDR 2 RAM
Native Instruments Audio 8 Sound Card
ATI Mobility FireGL V5200 256MB Video Card



My wish:
To Disable/Modify the "Total available Graphics Memory" to remove as much System RAM as possible and only leave Dedicated Video RAM.

My reasoning:
In using my DJ Software, there are instances of when I am browsing through playlists which involve many visual changes on screen, this in turn leads to Pops, Cracks, in the audio output.

My logic behind this is that the video card is requesting system RAM to handle the visualizations on screen and actions occurring, while taking over/impacting needed resources dedicated for audio playback.

Currently the Total available graphics memory is listed at: 1535MB
Dedicated Video Memory: 256MB
System Video Memory: 0 MB
Shared System Memory 1279MB
I would like that Shared System Memory to be as close to 0 as possible.

Any ideas? I would hate to think that both Vista and XP kill the user base for DJ's out there and that I would have to consider going to XP.