Thank you very much for your time.
I tried this way to input Japanese system to laptop.
I still read Japanese but I can't type in Japanese like before.
If I know japanese layout keyboard I can write in Japanese....
When I was typing in Japanese(with ro-maji input) I think I hit some key then change to Japanse layout.(like "CTRL+SHIFT or something like that..)
I am sorry I can't explain good enough.