remove your video and sound card only for that game.
friend,it sounds strange that such a high configuration like your's can't run pirates of the carribian. I have a p4 2.4ghz,win xp os,only 256mb ddr,no additional sound card and no graphics card(my motherboard is intel 845gvsr,hence no agp slot at all),but the same game runs very well on my pc.If you are really crazy to play the game uninstall your additional video and sound card.