Your computer, from time to time, will gather a whole bunch of junk information that will start to slow it down. Start by deleting files, like documents or music files, that you no longer need or what. Also, uninstall any programs you don't use. In your internet browser, delete your temporary internet files in the tools menu by clicking on options. Finally, the best thing to do after all of that
. is defragment your computer by running the de-fragmentation tool in the system tools section of your start menu.