Problems with flashtool on Windows 8.1 topic

Hello everyone, I have a Problem. I want to flash on my Xperia Z the Generic German Firmware. But I always get an error. When I had Windows 8 it was all fine and it worked. On 8.1 I get error. See picture

On my old PC with Vista I tried to start the flashtool but I get Java startup error :(
I'd would be great if someone could help me :)

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