I received an 'Incorrect password' message during installation using NasNavi.exe. I searched the Downloads section for updated NasNavi.exe and found NasNavi2.exe.
NasNavi2.exe accepted the default admin password, 'password', and allowed me to complete the install.
To download NasNavi2.exe in the Downloads sections, under 'Network Storage', select Product Name: LinkStation EZ™ LS-CL.
http://www.buffalotech.com/support/getfile/?nasnavi-215.zip
FileSize PostDate Ver OS Support Notes
3.19 MB 2008-10-24 2.11 Windows® Vista NasNavi 2 for Windows
Windows® XP
Windows® 2000
Windows® Server 2003
Also note: the 'Server' service must be running on your pc in order to setup and access shares. The network protocol: 'File and Printer Sharing for Microsoft Networks' also should be enabled in your LAN connection properties.
I hope some find this information useful.