Padshop "Sample cannot be found..." Error

I recently installed the version of Padshop bundled with Nuendo 8 and upon launch in the DAW it displays the “Sample cannot be found. Install the content pack” error message.

As I’ve installed everything that came with the bundle, I’m not sure what the problem is. I made sure the “For all Users” box was checked and Padshop was installed to the default location (I did, however, install some of the other synths to a second HD to save on C: drive space).

I’m running on Windows 7. Any ideas?