Hi eric93se and thanks for your support.
I'll look into this in the upcoming weeks.
I guess adding RAM isn't worth the money, so maybe I'll look into buying a new hard disk drive, or maybe I'll save a little more money and be getting myself a new laptop (some 13.3" models look very great, so expect more questions from me on that later!)
As a side note, my laptop currently suffers from overheating when I play games, sometimes it even shuts itself down completely. Is there anything I can do about this, or is this just because of its age?