MacBook noise when online

Hello,
For the last few days, and mostly when I'm online, my MacBook seems to be working hard - clicking, humming etc - especially when I try to do any function. Also, it seems a little slow and even when opening an MS document, I sometimes get The Wheel of Doom. Occasionally the flash player quits Safari.
Any advice? Macbook around 3 years old. I have loads of space on the disk. Thanks.
By the way, I'm utterly untechnical.

Yeah, the thing's so rackety that Apple even put out a technote with all the symphony it creates so you can compare and be unworried: http://support.apple.com/kb/HT1723

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