Another option would be to Manually set the IP address of your computer to 192.168.1.149 with a subnet mask of 255.255.255.0
NOTE: Don't forget to write down the network settings of your computer before you do this.
then try the "BUFFALO NAS Navigator" to confirm it is online... then you can use a web browser to navigate to http://192.168.1.150
then you can change the address to match the IP address of your network.
don't forget to change your computer back to the original network settings.