It is called the Nas Navigator.
The Link to the software can be found here.
http://www.buffalotech.com/support/getfile/nasnavi-234wr.zip
Try this rset process and then run the application.
Please switch the unit to off and wait until the lights are off.
Hold the function button for 10 seconds while it is still off.
While still holding the function button after 10 seconds please flip the switch to on.
Once the function light begins to blink release the function button and press it again for one second.
Wait until the power light is solid and this will restore your unit.
This process will not delete any data and will only restore the admin password and set the IP address back to DHCP.