USB device glitch/slow down in Vista 64bit

[Guest]

Is anyone else having issues with Vista and USB devices? I have a Stello
DA100 DAC and use foobar for playback. After listening a while the playback
starts to glitch and I get a fairly annoying pop/crackle maybe once a minute
or so.

Also my mouse cursor seems to stop/jump for a split second at the same time
with the audio glitch.

This box has 2GB RAM and an experience rating of 5.1 (CPU being the slowest)
so it shouldn't be a system resource thing.

The same setup works in XP without any annoying glitches, no matter if I'm
defragging and encoding a movie or two at the same time.

 

[Guest]

Ok, it's not just USB, for example while defragging or doing something other
heavy i/o tasks even audio through X-fi starts to glitch with the same mouse
lag/jump as mentioned above.