Computer running slower than usual?

for the past week my computer has been running really slow. i have done so many virus scans, but it always says "no unwanted or harmful software detected. your computer is running normally"....any ideas as to why my computer is running slow? i havent downloaded anything new, and my computer is less than a... show more for the past week my computer has been running really slow. i have done so many virus scans, but it always says "no unwanted or harmful software detected. your computer is running normally"....any ideas as to why my computer is running slow? i havent downloaded anything new, and my computer is less than a year old...
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