some issues with kworker and cpu

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http://ubuntuforums.org – Hi all! This is my first post on this forum so I'm so glad to be here, I use ubuntu since 8-7 years but this is the first time that I can't fix a problem with just italian forum... Here is it: I have a problem with kworker which overcharge my cpu, I tried to upgrade kernel, to make a new OS installation and so on, my cpu is still working at 70% and my legs are really hot right now, so, please, help me! I also found out this but doesn't work, I think is too old: http://ubuntuforums.org/showthread.php?t=1796873 My machine is a asus x53s i7 - ubuntu 13.04 64bit 3.8.0-25-generic - nvidia geforce (Hardware)