Vista - Change font of IME candidate window and Hand Writing problem

I have installed IME for writing in japanese.
But the IME Pad Hand Writing doesnt work, i can draw, but in the lef box all
the sugerences are white, are invisible, I have to mouseover them to see its
reading and guess it.

And the main problem i got now: I installed (simply copy&paste) some new
japanese font and now the IME has changed to it. I mean, when i write
something and press SPACEBAR, the candidate window is in another font (not
the original MSMincho), it changed to a callygraphy one, in a very small size
and i cannot use it anymore. Even the text from the "dictionary" tooltips are
on that font.

Now IME is useless, i have to use another program (NJStar to look for
radicals and to write, and copy&paste on other programs, because choose the
correct option by pressing SPACEBAR now is useless.

Please help me.

I add: I tried to uninstall all these fonts and reinstall Asian language
support with IME, but the the candidate window has "blank" font. Simpl
invisible, onl remains the option number (1,2,3,4,5 ,etc) but the suggested
option is invisible. Also tried to delete every entry for that font on the
REGEDIT but still, IME is attached to that font. Or I use it (and it's so
small i can't see it) or i don't (and then all goes blank)