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Send your laptop to us and we will diagnose the...
What is your operating system, amount of RAM, CPU speed, and graphics card?
What DVD are you trying to play and have you attempted to play other DVDs?
What software are you using to play the DVD? Windows Media Player?
Also, there are no 'DVD decoders' - no such thing exists. Was it an audio codec that you downloaded? A driver for your DVD drive?