If you use your computer long enough, it gets clogged up by all sorts of programs and files that just take up space. Finding out what exactly is clogging your system, can be a difficult task.
To get nice overview of what is sitting on your computer, download and install SpaceMonger. This utility gives you a summary of what files are taking up space on your hard drive, by grouping them together and displaying their relative sizes.
There is a free version available that will give you this information, but you can also opt to download the commercial version, which includes a range of extra functions.
Go to this website for the free version (1.4) and to this one for the commercial one (version 2.1) which has a 30-day free trial.
The free version is considerably toned-down, but it will give you a good idea of what is taking up space on your computer. However, seeing as you can use the full version for free for a trial period, you might as well try that one out too and see what extras are to be found in it. If you like it, then buy it.
To view what is taking up space on your hard drive, using version 1.4:
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