I would recommend that you delete any old files and programs that you no longer use. Then I run your disk cleaner (or CCleaner), and defrag. It may also be helpful to run an anti-virus program, seeing how a virus could be the rest that your computer is running slow. Another thing you can check are the processes running. Sometimes you can have processes running in the background that are taking up valuable CPU that you don't need.
Both are useful. Each one does different things. CCleaner helps to keep you disk space clear of junk and unwanted programs...Anti-virus keeps you protected from mal-ware and viruses. Each category can cause your computer to slow down in performance.
hey jhudson plz help me bro...wat 2 do..??my system gets slow down while scannin...
well I guess first of all you might need to use antivirus that don't use that much system resources,Avira antivirus should be good for that,and secondly you might need to disable some softwares running during startup in the background....which would atleast not clog the resources that much....and by the way how much physical memory does your computer have?