I own a Sony Vaio FX405 with Matshita UJDA710 DVD/RW Combo drive. This has functioned normally under WinXP Home. I have ungraded to XP Pro, however, now the drive can only read/write CDs, it CANNOT read DVDs - the volume appears 'empty' in explorer. I can playback audio CDs. I have already checked relevant threads, mostly people report the converse problem. Sony support doesn't mention this problem. Panasonic also seem rather elusive re:Matshita drivers etc. I have installed relevant codecs and Intervideo WinDVD software. I am reluctant to revert back to XP Home. Can anyone help! I'm mystified!