Sounds like crappy win 7 drivers to me. Even though the onboard sound generally unloads more work to the CPU than a dedicated sound card, thats a bit high. What motherboard and CPU do you have? I suggest checking the manufacturer for better drivers.
hey megamanx. i have an ECS motherboard with G41 chipset. G41T-M6 and a Core 2 Duo E7500..
the driver cd that comes with it is the one that i installed..