I have a PowerPoint presentation created on Microsoft Windows. When I play it on an iPad there are great typography distortions. There are a lot of fonts not found on the by iPad. Could I install my own fonts on an iPad, or solve this in another way?
Unfortunately, the iPad does not support the installation of fonts by the user, and microsoft office documents do not allow font embedding. If you wish to maintain consistent typography you'll have to use a document that supports font embedding such as a PDF.
In order to obtain similar results in typography on a Windows PC running PowerPoint and on an iPad, perhaps you should construct your PowerPoint presentation with fonts that are already available on the iPad.
Apple's list of fonts in iOS 5 is here.
If you want things to look the same on different platforms, it is always a good idea to restrict your presentations to the basic fonts Arial, Courier, Georgia, Times New Roman and Verdana.