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Check your virtual memory. If you have your HDD filled up it starts infringing on the VM and will affect your Video cards memory swaps as well. Transfer files to a memory card or external HDD. Then run Disk Cleanup and defrag
It could be a physical problem such as your cooling fan is full of dust or has stopped turning all together. Laptops run hot already and needed all the cooling they can get. Heat will affect performance.
If rebooting helped then you could have had a lot of background processes running.
Go to start - run - msconfig and see if there's anything you can eliminate on startup. IF you don't know what something is you can Google it and several sites will advise on if it's necessary to run at startup.
IF you have multiple toolbars on your browser, search helpers, etc. Get rid of them, most are unnecessary.
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