Need Replacement Inspiron 7500 DVD Software Decoder CD

Hi,

I am a newbie here and could really use some help...  Does anyone know where I can get a replacement for the DVD System Software Decoder CD for the Inspiron 7500.  I have the TORiSAN DVD drive.  I have recently installed XP, and lost my decoder disk and would appreciate any help.  If possible and if the software is free could someone upload it and email me a link at Greg@GregOutlaw.com

Thanks in advance for your help.