My Creative DVDRW 8420e shows up in explorer, and opens when I click Eject from the right click menu, but it won't read disks. This happened after I upgraded to SP2. I have previously installed and uninstalled products from Roxio, Slysoft, and Nero. There must be some kind of registry entry causing this. I have removed the drive and restarted, then shut down and re-installed it. I have upgraded the firmware.