Are you having multiple windows open at the same time..If so how many and are the very graphics intensive...Do you have any other programs running in the background? I noticed you have norton running. uninstalling it and installing something that doesnt murder your machine (this is only my opinion of norton and how I have seen machines grind to a halt after norton is installed). Try using something like AVG antivirus. I know alot of people dont like it but use it to test and see if it solves your problem. Let me know how you get on.
Smeg
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Smoke me a Kipper I'll be back for Breakfast..!