Glenski,
The engineer that produces these drivers for us that talk to the CD-R drives, has changed some of the items in the drivers, and by doing this the older CD-R drives are no longer supported past version 2.400.
This is stated on the Microstudio page located at:
http://www.mtu.com/basics/karaoke.htm
It is in the box around this saying that if you had an older Sony or HP or Yamaha drive it won't work anymore.
The only drives that will work anymore with Microstudio are the Plextor drives excluding the ones listed in this post:
http://forum.mtu.com/showthread.php?threadid=1106