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Norton for over a decade.
Are you sure its your anti-virus slowing your PC down? If you've had the AV for a while then its probably not the cause of your problem. If its a new version go back to the previous version and see if things improve.
A slow down can be caused by many things. If your disk is on the full side and fragmented as a result this will cause a slow down. A little housekeeping using Microsoft's Disk Cleanup or a something like CCleaner (free) will delete your cookies, temporary internet files, items in the Recycle Bin etc. Once this has been done you need to run a Defrag programme - more than once. If the disk hasn't been defragged for a while it WILL take three passes to fully defrag the disk.
Another possibility is new software that you may have installed recently. Some programmes eat resources so check how much memory is being used. Close things you're not using.
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