How to Install Japanese input onto BB 9650?

How to Install Japanese input onto BB 9650?
I am sure someone may have asked this but I was hoping for a more current thread. I have the BB 9650 and I did have Japanese fonts installed and I could even input in Japanese. Now all of a sudden it's gone. I have tried to re-install the OS that had the ability to read and write in Japanese...but now it is not even an option. WTF? Side note...can computer viruses get on BB's? UGH!!! Thanks in advance for any help..advice...mallets!!!!