Incredible noise on the macbook

Hi
More than 2 months ago, I had installed some kind of software update. And I think this problem has began since that date. Within 5 minutes of operation of my Macbook, the fan starts operating very very loudly (louder than when you insert a CD). And until I shut the computer off or put it on sleep, this noise will continue, even if i am not doing any operation. Any suggestions on that.
Because of this problem, my battery life has been reduced to 1:30 max. I have recently replaced my battery. When there is no noise for the 1st 5 min, the battery life looks normal. But as soon as it starts making this noise, the battery life drops to 1:30 max.
Any suggestions?
Thanks for the help guys.

Check your Activity Monitor. You probably got some process running in the background causing excessive CPU usage.
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