DVD-Drive Issues

Greetings,

I recently upgraded from Vista Business to Ultimate, and throughout the upgrade my DVD-RW drive has had no problems at all.

However, today I noticed that when I went to put a disk in my drive that it does not get detected.

I look at the device manager, and sure enough I see the line

"TSSTcorp CDDVDW SH-203B ATA Device"

I decided to look at Magic Disk and I noticed that it is no longer starting up as it used to when I boot so I go to start it up, and I get the following error (even if I run it as administrator... even though I turned UAC off)

"MagicDisc can't open driver(mcdbus), Please make sure that MagicDisk is run as administrator. You need to right-click MagicDisk.exe on Windows Explorer, and click "Run as Administrator" to run."

The error within Device Manager is

"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)

Click 'Check for solutions' to send data about this device to Microsoft and to see if there is a solution available."

Anyone got any ideas? Thanks.