Why is my computer so slow?

So basically I have an iMac early 2008 with 2 gb of ram, a 320 GB HDD, a core 2 duo cpu, and a 2600 radeon pro gpu. its so slow it takes 8 minutes to boot and it takes several minute to open any applications and web browsing is so slow even though I have 1 gb wifi at home and my parents computer's connection is... show more So basically I have an iMac early 2008 with 2 gb of ram, a 320 GB HDD, a core 2 duo cpu, and a 2600 radeon pro gpu. its so slow it takes 8 minutes to boot and it takes several minute to open any applications and web browsing is so slow even though I have 1 gb wifi at home and my parents computer's connection is fast. why is my computer so slow
Update: and games are really laggy their unplayable
Update 2: I need help please this is a serious question
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