Why is my Mac Book Pro making a lot of fan noise?

My Mac Book Pro suddenly began making a lot of fan noise, I did not install any software nor have I been using it excessively. I don't know what to do to make it silent again! Please help. Thanks in advance.

Down load from the Internet and install iStat pro.  It will record the internal temperatures and fan speeds of the MBP.  Also open Activity Monitor and set it to show 'All Processes' and '% Cpu' to display values from high to low.  When your MBP makes the noise, take screen shots of both and post them for evaluation.
ciao.

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