Audio Problem: When reproducing something "System" uses too CPU

Hi everybody,
I have a problem, as I writed in the title when I reproduce a video, a song, any sound, in the task manager I notice that the process "System" uses too cpu. I had this problem since the last sunday, but I didn't nothing! Saturday evening I hybernate my pc as usual. The next day I turned on the pc and I noticed the problem.
After I noticed this problem I did an antivirus scan(a light one)(I use avast! antivirus) but it didn't find any virus, I tried to update Realtek drivers and the others, but nothing changed. I post here my pc model and everything you need.
PC: Notebook HP G62 - 165 SL
Operating system: Windows 7
Here I post the task manager screen.[Click HERE]
If you need further informations ask me for them.
Sorry for my bad english

Let me know if it helps or not. I'll keep an eye out for your reply.
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