I was using on my Sony Laptop with Vista and Premiere Pro 2 and it worked fine.
Try checking your firewire cable is in properly (try 2 different cables, one may be bad) and make sure that your capture settings are correct, with proper Camera selected.
Also check that your computer is compatible with Premiere Pro , they used to have a problem with AMD processors a while ago.
If all else fails then theres a problem with the firewire port on either the Camera or computer. Try to connect each to different firewire devices and see if they actually work.