How did FIs manage to teach their students before Bill Gates? Does anyone really think powerPoint is the solution to good teaching? I've been creating ppt crap for ages in my day job, for all purposes imaginable, but I rarely use it myself. It really requires that you know what to put in there and what not to put in there. If you can explain using your body, a pen, paper and model then you don't need an electronic wizz box. Think about what you're trying to get across, practice what you're saying and how you display it, by drawing, using a model or something else and with time you'll find a good combination of tools that doesn't involve a frikkin PC.
NASA banned the use of PowerPoint after the Columbia disaster apparently...