Your computer likely has a lot of programs on it that you no longer
need. While not all of these programs are necessarily slowing your
system down, the more you can clean out the better you are.
To get started, click on [start] then choose [control panel]. Once
you're in there, click on [Add/Remove Programs]. You'll then see
a list of all of the programs installed on your computer. To remove
a program, simply click on the [modify/remove] button on the right,
as shown in the picture below: