I have a four year old IBM thinkpad A21m, type 2628, windows 2000, Mashita DVD-ROM SR 8175, DVD play driver. The drive reads CD's fine but when I put in a DVD, I always get a message saying "drive is not able to read DVD - no decoder". This is the original drive but I have never tried to use a DVD before. I went to the IBM website and downloaded an upgraded driver (Metormedia), but I got a message saying that that drive is not on my computer. Can you help me locate and download a "decoder" ? Thanks for any assistance.