What's wrong with my MacBook?

i have black macbook - 2.4 core 2 duo 2 gigs of ram. in past few months, computer has become progressively slow. no additional applications have been installed. if i'm playing video on youtube , open application (i.e. word) audio cut off video. loading programs has become slow process well.

thank in advance,

 

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have @ activity monitor (applications / utilities /) , select all processes , sort cpu see culprit may be.
check "system memory" tab see "page ins:", "page outs:" , "swap used:" are.

image below uses sorting cpu example

further reading:

mac os x: reading system memory usage in activity monitor
making of activity monitor
what activity monitor (or how take mac's pulse)​

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