Hi. My Sony DVD+RW DWP50A doesnt detect any kind of DVD I insert. It DOES play audio CD's though. I have tried rental DVD's and data DVD's with my own movie files. I have deleted and reinstalled drivers through device manager, rolled back to previous drivers, and tried system restore. It happened once before and I followed advice for deleting upper and lower filters in the registry (that worked). But this time it doesnt work. Nothing has worked. ANy advice?????