Hi all (and Jeff....probably dislike this one by now...)
Okay, Small Business Server 2003, service packed etc etc (Premium edition)
Take a PC - dont join it to the domain (Windows XP sp2 etc) and "explore" the server company shared folder. Great response no prob.
Same PC - join to domain and "explore" company shared folder and i might as well make tea....
Take it off the domain and its quick as lightning.