Problems with SMB and large directories

Hi, I'm having issues interacting with a mount of a large windows
directory. The computer that hosts the directory is running Windows Xp
and is on my LAN. I can mount and cp,ls,etc,etc smaller directories, but
after it _appears_ to mount the large(4.7GB) remote directory It wont
let me cp,ls ot so anything else with the directoy. It just hangs and I
can't kill the process. Any settings I could tweak or something ?
BTW Im running a fresh FC2.

Cheers