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Yes, 3/4" subfloor with cement board or ditra for underlayment is needed. This keeps the grout from breaking. Laying tile right on subfloor is not the way to go. You can try using wallpaper stripper to get the old glue up. The kind you mix with water works pretty well but it takes time. Soak some rags in it and lay over glue while you're taking up other tiles. Don't use anything flammable. Here is a real great forum for people who have questions on tile setting---lots of pros there to help you along. It's the John Bridge website.
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