Anyone knows how to use asus ai manager?

I have a window vista asus ai manager. After one year my computer ai manager would tell me that the temperature is abnormal. Now it would lose the signal to the monitor whenever I play a game to long. I have recently been able to clean my computer so now my fan is dust free. it still go to at least 54-57 degrees celsius when doing non-gaming stuff. So what i want to know is if its possible to change the fan speed and if so to how high? Also what is a good temperature a pc should be? My computer heats up to 60-65 degrees Celsius before monitor loses signal and when idle or surfing the web it goes about 52-53.