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Excessive CPU Usage

My pc has Win XP(Sp3) and IE 7.0. When I open a web page my cpu usage(task manager) in iexplore.exe runs at 80-85%. Obviously my pc becomes very slow. I use Symantec Endpoint Protection and perform weekly scans. I have also performed other malware scans. I might add this does not occur in all web sites but in a large percentage. The cpu usage will remain high for awhile and drop to normal and then spike up again.
Any suggestions as to what might be causing this problem?

Thanks.

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Comments
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Seems proper today.

You noted that many web pages do that. It's the scripts on the page or even animations.

Nothing busted here.
Bob

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Also

Also be sure to check the XP DMA bug. And while you're at it, if you're going to be foolish enough to continue using Internet Explorer, and making yourself a target for malware, you should at least upgrade to IE8 for security reasons. There are a number of known exploits for IE6 and 7 making the rounds, which don't work on 8.

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