This was a win 7 problem that was updated with a hotfix, however your particular readout of LatMon reveals a very high dpc for Usbport.sys.
Much more common on laptops... do you have a laptop?
Is the NI interface on its own usb port with its own IRQ?
Have you unplugged every usb device you can manage, especially hubs?
Have you performed the usb audio tweaks on the focusrite and Sweetwater sites?
Many laptops have multiple usb ports externally, but only have a single port available on the mobo.
Good luck
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