TS-L632H ATA DVD RW abruptly quit working on Dell Inspiron 1501 laptop (Vista Home). Device shows to be present and drivers good and says device is working. When I put any kind of dvd in drive and click on drive letter it rejects disk and "put disk in drive" comes up. I think this may be due to a Virtual Box Guest Additions software I instaled just before problem started. This software initially caused boot problems.