Delta 66 & Delta1010 distorted output

Hello,

I Just switched to Windows7 and I noticed a little bit of noise over the sounds that are coming out of my deltas cards. Sounds like white noise and seems more important when dynamic (volume) changes.

My Setup:
-Maudio carda are sync via SPDIF.
-Windows 7 SP1
-Maudio drivers 6.0.8
-HP Compaq 8100 Elite Convertible Minitower PC, I5 CPU

Here's what I've tryed so far:
-Swapped master / slave for sync and tested both outputs:
-Both are noisy.
-Made sure my source signal was clean so I sent the built-inn soundcard:
-It works perfectly.
(now I'm using the bell sound found in Control panel, Sound, Playback tab, double click an output, Advanced Tab, and Test)

Next week I'll put back the cards in the old XP computer and doubble check that the hardware works whitout noise

Any idea to help is welcomed!
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