Lite-On DVDRW SHOW-1633S won't read DVDRW

I have a Lite-On DVDRW SHOW-1633S. I copied a movie from a DVD-RW to a DVD+R yesterday and today my Lite-On Drive will not read any DVDRW disk. It reads DVDR +/-, CDR and CDRW but won’t read any DVDRW +/-. I have also noticed when I look at the drive in explorer it lists the drive as DVD –RW (E) with no disk inserted while it normally shows it as CD Drive (E) until I put a disk in. Any help anyone could give would be greatly appreciated. I am at a total loss as to what is going on. :confused: