sharing folders in Xen?

I’m forced to use Xen for my VMs because it is the only VM system that will share 8 CPU’s on a VM. The trouble is I can’t seem to find a good how-to. I need to share folders and/or get the network running. I’ve added bridged network connections, but the Guest OS (Win2003Server) reports “limited or no connectivity.” If there’s some way to share folders with the host, then I could bypass this. I just need to move files between host and guest OS’s.