I have Windows Vista Home on a new computer (Duo-core processor). My primary drive is a 250 gb serial drive. My secondary drive is a 400 gb regular drive (not serial) and I have a DVD burner/reader. My problem is that the secondary hard drive, and at times the DVD, disappear - you go to Windows Explorer and they're just not there anywhere. Then on a particular reboot, it will suddenly identify the hard drive again - and it works fine for a week or so and then disappears again! When the DVD disappears, a reboot brings it back but that isn't the case every time for the secondary hard drive. Help!!!