How much ram do you have in your box? I'm reading that many folks with more than 2 gig of ram are having problems with this card when running Win7/64bit.
I am using (4) 1 Gig sticks of Corsair XMS2 PC6400 800 mhz DDR2 in dual channel mode
installed on an ASUS M3A32-MVP Deluxe MB, with AMD Athlon 6400 X2 3.2 ghz dualcore AM2 CPU
my ASUS Ati EAH3870 videocard has the HD Audio disabled ( I disable it in the control panel )
I had problems when I had it enabled on my WinXP OS along with my X-fi soundcard, so I set Windows 7 64 bit OS up the same way I had it set up in Windows XP...
edit: what all features / extras are you running/let load up when you first boot up? if you do the default setup ( recommended setup ) verses Custom setup..you are letting a whole bunch of un-needed things install, like auto-update, etc.... Creative Auro-Update Website & stuff.......
in the Creative forums ( I got some bookmarks saved on this stuff ), you can do a search and their is like 8 to 15 different processes that could be running that is all bloat stuff.....
hope this helps.....