Why can't I download the latest Boot Camp installer when first configuring Boot Camp?
You should be able to select the option "I have already downloaded..." this will let you continue with the Boot Camp partitions and then install Windows from the disc. 

You should install Boot Camp within Windows from your Snow Leopard Install CD and then you can update Boot Camp by downloading the Updates from support.apple.com.

I had this issue with my Mid-2010 MacBook Pro at first.