Before worring about those temps you should worry about your 12V + line it's too low
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what is suposed to doe? I use OKIA switching power supply 420W MAX
I'll explain , every rail of a power supply should work between -5% or +5% of it's actual voltaje so for a 12V + rail it should be like 11.4 minimum and 12.6 maximum and your PSU is on the limit of the minimum when your PC is idle.
How i do to get it highter and what this does? overheat?
You can't get it higher unless you buy another PSU. The high or low rails may cause system to be unstable.
Unstabable? what do you mean? Like crashing?