Hello guys
Hope someone can help me out...again!!

Recently i've noticed that the fan in the pc goes so fast that it's quite worrying. It would make quite a bit of noise when i run certain appliations e.g. power dvd and other times you can barely hear it. Why does this happen? am i being paranoid? I've reduced the start up programs and services and done all the necessary checks and defragged, but still quite noisy. Also whenever i try to connect to IE it takes quite a while before the page comes up. Can anyone explain why this happens in very simple...i.e idiot's guide simple language just so i can get a bit of understanding.
Many thanks