IMac keeps freezing for some reason?

Every time I try to watch a video or play an online game, (anything that moves) it freezes every 10 seconds. Even typing this message just now it froze for a second. What is going on? It isn't my internet because I have reset it many many times. Can anyone PLEASE help me?
P.S. It's a newer iMac, I bought it last year. I also just recently installed Snow Leopard. I think that's the problem? (By the way it froze twice more while typing this).

HI Nick,
I assume you are using the Safari browser.
Try uninstalling the Flash Player Plugin, then reinstall it.
First, uninstall the Flash plug in you have now.
http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_14157
Next, download and install the most recent version of Flash Player Plugin here.
http://www.adobe.com/shockwave/download/download.cgi?P1ProdVersion=ShockwaveFlash
Quit any open applications. Launch Disk Utility (Applications/Utilities). Select Mac intoshHD i the panel on the left, select the FirstAid tab and click: Repair Disk Permissions. When it's fished, from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. They can be ignored. As long as you see, "Permissions Repair Complete" .. you're done.
Do Safari Maintenance about once a month.
And information here regarding Mac OS X - Maintenance.
Carolyn

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Does it get extra hot before it freezes?
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http://discussions.apple.com/thread.jspa?messageID=4710316&#4710316
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