Windows 7: System interrupt Process.

Hi guys i want to ask u something and if someone can help me i would appreciate. Well i'm on windows 7 Pro x64 . Whenever i download something from the internet ( let's say a medium speed 1,5 MB/s ) my processor goes wild becose of a PROCESS called System Interrupts witch is stressing my cpu 20-30%. It's definetly from the network adapter because i did alot of stuff like : stressed ram , stressed CPU , stressed HDD's , nothing happens,only when network is in use. My network adapter is : Intel(R) 82566DC-2 Gigabit Network Connection , and the motherboard is : Motherboard Name Intel Dragontail Peak DP35DP . I use the latest drivers for windows 7 x64 , and i installed windows 7 x86 and i have the same problems. I use latest drivers for chipset/network addapter. Can anyone give me a hint about this ?

Load when internet connection is not in use or it's only using 10kb/s :
http://i46.tinypic.com/or43ef.png



Load when internet connection is in use i was downloading a 100mb file with 1,5 MB/s
http://i46.tinypic.com/2dt3w9k.png