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Harry is absolutely correct. You haven't given us enough information to help answer your question.
I will say that I have not seen very many textbooks in formats other than PDF. However, since PDFs generally embed the necessary fonts, your description leads me to believe you don't have PDF files.
It might be that you have a poorly converted or OCR'd version of a PDF file. In which case the garbage characters you are seeing are just that - garbage. You would have to go back to the original to understand what they were meant to be.
However, there is a very slight possibility that your ebook is referencing unicode characters which your current font doesn't support. Or, even slighter, that your ebook references a non-unicode font which you don't have installed.
The last two possibilities are fixable - but we'd need more information to be able to help you. What kind of file is it? and it would be nice to see a pic of what you are seeing. (or attaching the file is another nice helper.)
Troy
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