USB Audio Interface with bad latency problems under bootcamp

Hi everyone,
I am currently running an Edirol UA-25 USB audio interface under Mac OS X for my normal music-listening needs. Everything works fine, and there is next to no latency when messing around in Garageband .
However, when I switch into bootcamp to use Cubase SX 3 for audio production and sequencing (has all my windows-only VST instruments), the interface pops and crackles extremely. It's almost as if the USB interface is losing sync..?
When I turn the buffer up on the drivers, this stops, but it is annoying as I like to have low latency when recording for direct monitoring.
Can anyone give me any insight into why this might be happening?
I know this is an audiophile-type question, but I thought I might as well give it a go. Or heck, if you wanna direct me somewhere where they might be able to help me!
Cheers!
Chris
P.S. Using a MBP 2.5GHZ 2GB RAM

when you select , lets say the USB device in your audio preferences, it will be used as the input and output device. You can use the USB interface's audio outs plugged into your mixer, and use speakers or the headphone jack. When you create an aggregate device, using the USB device and your built in audio, and choose it in your audio preferences, this allows you to use the inputs and outputs of both the USB interface and your built in audio from your mac. So now you can record from one device while listening back on another. meaning you can record the audio from the USB device and listen back using your Mac speakers or from headphones plugged into your mac.
if you get a better audio interface, one with mic inputs, you will still need to connect it to speakers or plug in headphones to it to hear audio. If you have the budget, a dedicated firewire audio interface will usually give better results, in audio quality, than a behringer mixer and a usb interface.

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USB Audio Interface with bad latency problems under bootcamp

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