ikeinblackriver
re real tek.
basically mate i dont recommend useing on board sound.
consider getting sometime a proper sound device.
with w7 compatible drivers.
from various postings i see in various recording forums it seems that
some sound device vendors are busy redoing drivers for w7.
some already have w7 drivers but some dont.

mebe it is a biab bug..only pg can answer that..
but the fact other people have biab
working in w7 makes me wonder if its system //user specific.

heres what i would do.
try another sound device either internal thats known to be w7 compatible,
or an external usb sound device thats w7 compatible.
if you find the problem goes away, then this suggests a real tek issue.
(talk to anyone makeing songs useing daw pc and most people dont use the on board sound. )
if the problem doesnt go away , mebe indeed its a biab bug.

another comment.
with a quad core pc like yours most people with such dont record to
the same drive as win resides on.
(i'm sure your aware of such things as writing virtual memory to disk and head contention etc.)
thus i always recommend a second internal 7200 rpm drive wit 32 mb cache to record to mate.
thus leaving win free to do its thing on its own drive.
(7200 rpm 32 mb cache drives are a no brainer these days..70 buks.
read my tips in the tips n triks section of the forum for added daw tips
to save me retyping lots.).

retired puter engr....powertracks on amd......NICE !
"what is the black art of audio engineering ?"
my silly songs...motagator.com/bmanning
see my tips in the tips section.