hello!
so i uninstalled SCIM and installed UIM. the problem with the freezing keyboard has gone. i can write japanese now on most windows, except amsn and skype (maybe others as well, haven't tested it yet). i should search this more before posting but i really do not have the time now (again :S). just reporting my status

i will find some time tomorrow and find the solution to this, i think i saw it someplace when i was searching for my first problem

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(ps. by the way, i just noticed, vivia are you greek?)