A Sony DVD drive model DW-U50A is stalled on my Sony laptop model PCG-GRT270P. The OS is Windows XP professional with SP2. I inserted a DVD movie and played it. The pictures is suddenly stopped and played again. That problem keep repeating. I updated the motherboard BIOS, DVD drive firmware and driver but the problem stayed the same. I have tried to use many different programs to play a DVD such as Power DVD, Windows Media Player, WinDVD, however, there was nothing improved. Please help me. Thank you.