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Most bottom-tier support can be categorized as maintenance. Computer maintenance is an art and a science. The basics are: install (properly), organize (intuitively), clean (obsessively), backup (sensibly), remove (cautiously), and repeat.
Since the average user purchases their computer with most of the installation done, this step might seem trivial. The basic rule: if you are not sure you need it, do not install it; if you are sure you need it, know where you are storing it.
Most users collect a number of files during their computing life. One of the most frustrating and time consuming tasks is simply finding what you are looking for. Learn the basics of the file system and store all of your data in the same place. Use a naming system that makes sense to you and to others, in case you get confused.
more to come...