i just reformatted my computer, all the drivers and windows updates are already installed, as well as the newest premiere updates. other programs will detect it and even output to the camcorder but not premiere. it worked fine with cs4 on vista 32 on my old computer. i am running an intel I7 with 6 gb ddr3 ram.
Try with Scenalyzer. PR is picky when it comes to firewire connections. Do you have other firewire devices connected? If so, disconnect them and try again.