Outlook 2K Forces Second Network Logon

Scenario:
Windows 98 machine running Outlook 2000 in TCP/IP environment

1. User logs onto the network (username, password, domain – all entered correctly)
2. User launches Outlook
3. Outlook forces user to log on to network again before completing launch (although initial logon was successful – varified by my being able to browse and access/open various files in the Network Neighborhood).

I have about 200 PC’s on this network with only one with this problem. I haven’t yet tried uninstalling and reinstalling (would like to avoid that if possible), but that’s about the only thing I can think of left to try. If anyone has any ideas or suggestions, I’d love to hear from you!

Thanks,
Bart Snell