I don't know if anyone has covered this with you, but have you gone to advanced view?
From simple view, click on 'view' and then 'advanced view'. Then under the 'tools' menu option click 'computing preferences' and you should see something like this.
select the first tab and the then set the last 2 items to 100%
Thanks, set "while processor usage is less than..." to zero. Default was 50.