Here is my problem. Back in '07 I bought a box set of DVD concerts. Got them home they played fine. This was on an XP-SP2 system using the nero of that year. XP crashed and I had to do a complete reload of the OS. Since then these DVDs do not work. I am now using Windows 7. The DVDs are DVD-9 region code PAL4. I have software[AnyDVD] that overcomes the region code but both my DVD drives won't even acknowledge the disks are there. I have a Samsung 16x dvd player model SD-616E and a Benq DVD/RW model LS DW1655. I am confused because I distictly remember watching these vid, its not like DVDs erase over time. Anything that can help is appreciated.