I'm working with Bastiaan on the project, and we fixed the problem. It was quite an easy fix. The problem was that Windows (7) 'locked' the files, because they originated from the internet. To fix the issue:
- Browse to the folder where you unpacked your dll files
- Right click all of them (or at least the ones you wish to use) and click 'Properties'
- In the 'General' tab at the button, click the 'Unblock' button
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Don't forget to click Apply and/or OK, otherwise it won't save.