A note received from the state library:

I checked in with OCLC Support today regarding Netlibrary and Windows 7.
According to them, the Netlibrary Media Center is currently not fully
compatible with Windows 7 and Windows Media Player (WMP) 12 – which is the media player commonly bundled with Window 7 machines. They are working on providing full compatibility, and expect to be able to announce a target date for full compatibility by the end of December.

For any of your users who have shiny new Windows 7 machines at home, please advise them to use the ‘classic’ method of downloading eAudiobooks from http://www.netlibrary.com

If they were using the Media Center before, they may need to log in to
Netlibrary and check their account preferences to make sure that the ‘Use NetLibrary Media Center’ as a download preference is no longer checked.

Also, please note that the NetLibrary Media Center is designed to work
with only 32-bit machines; it is currently not compatible with any 64-bit
Operating System. They are assessing what it would take to create a 64-Bit version of Media Center, but do not have a timeframe at this point.

Please let me know if you have any questions and remember to check out more information about eAudio at http://will.state.wy.us/wyld/econtent/eaudio.html