How to fix a slow computer?

My computer has been going very slow lately, how do I fix it

Try to uninstall the programs that you don't need anymore. Also install only one anti-virus it cost the computer to slow down when scanning. I recommend you to used TUNE-UP UTILITIES. It fix the problem of your pc automatically and recovered disk space...goodluck

try, shutting down everything and then plug it back in. that worked for me or you could go and empty a thing that holds a lot of computer stuff out and it will work! acually, thats all that I got, im sorry

Maybe because of too much songs or pics you have to clean it by using ccleaner and adware programs and there are many other programs that clean your computer and make it fast

 
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If you supply information such as which OS you are using (Vista; XP; 98; etc) you might get better responses. Answer which OS you are using!