Just faced a nice error message on a computer running Server 2008 R2 after completing a sysprep : 
“Windows could not finish configuring the system. To attempt to resume configuration, restart the computer” which ended in an endless loop of reboot.
It seems like a lot of virtual drive applications can cause that problem. On my machine it was “Daemon Tools Lite” which was guilty. In facts, it was not really Daemon Tools, but SPTD (SCSI Pass Through Direct by DuplexSecure) which comes with it. Unfortunately, SPTD stays on your computer when you uninstall Daemon Tools: you have to download SPTD’s installer on DuplexSecures’ website, which will allow you to uninstall the application.
Now, your sysprep will work fine.
Thank you, you saved my day.