After a lot of disappointments I finally have Dragon Naturally Speaking 10 working on a MacbookPro with Parallels and XP with a reasonably cheap quality USB mic, a Zoom H2.
Now it's fast and accurate with Dutch, the language I dictate in.

If there are other people struggling with the programs, interested how I went on, I'm willing to write a manual, with al the settings and setups I tried & tested that did work, barely worked or failed completely.

If there are people interested, please reply with a PM. Then I make some time and set myself to it.