Slow file save to network

I have one XPPro system on my new SBS Windows 2003 network that takes about 10 seconds to save a small Word document to the mapped data drive. Other similar systems save in about 1 second. The only thing different I see on this system is that it is running Word 2003, whereas the other systems are running various older versions of Word. Any ideas of what to look for? I have the IP address of the server as the first entry in DNS. I have used msconfig to reduce items loaded at Startup. Not sure what else to look for. Thanks for any suggestions.