for the LAN settings, simply boot your Japanese OS and copy them down,
STARt/CONTROL PANEL/(IN CATEGORY VIEW)/ NETWORK AND INTERNET CONNECTIONS/(bottom)/CLICK NETWORK CONNECTIONS/
Then choose the NIC that you are using, and right click it, select properties and write down all of that information.
Then call your provider and get your account USERNAME and PASSWORD, if you don't already have it. NTT sends you a sheet with all that information. It has your email address and server info, it has your password and username, it has the DNS server addresses, etc...
As for the boot.ini file, once you have booted and you see that the Japanese OS is missing from the boot..
Boot the English OS, then click start, RIGHT click MY COMPUTER, select properties, then the advanced tab, then click under startup and recovery, SETTINGS TAB, then next to edit the startup file manually click EDIT, just CLICK EDIT, then copy and paste the contents of the SAVED BOOT.INI file into that boot.ini file. THEN MAKE SURE TO CLICK FILE, and CLICK SAVE!!!
Then reboot, and you should see your J-OS.
