My Mac is functioning worse than PC.

My Mac is running slow, curshes. takes forever to shut it down, and the click board doesn't work anymore, is there anyway I can take it to somewhere to fix it? Anybody recommand apple store? what's the estimate cost for that? other than apple store, where else can I take it to fix it?
I called the apple support phone number, it said my Mac is not regestered?
I bought my Mac from the official apple website, except one time, my friend updated the system, and I have no idea if it is register or anything like that. what am I suppsive to do?

Use the Safari menu to 'Empty Caches...'
Make sure to update any Adobe applications.

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    USELESS ONLINE HELP FACILITIES
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    This is aimed at Premiere Pro, but may help
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    Will the new Intel "Conroe" chip in the upcoming Mac
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