Troubleshooting : Need help with Ntoskrnl thread causing high CPU

You doing some good work helping people here. I decided to ask your help too.

My CPU usage sometimes reaches 25% (1 out of my 4 cores uses 100% CPU) and then after 2-6 seconds it returns back to normal. Because of that I just can't watch movies in high definition or play games like Battlefield 3 normally. I think these "CPU spikes" are the reason of my freezes in games and videos.

I downloaded the Process Explorer and found out that ntoskrnl.exe causes this loading.

So I made this trace.

https://www.dropbox.com/s/y2svbs37nk8gbiv/highcpuusage.7z

I would really appreciate your help.