problem language interface

with no reason today i open indesign 5.5 and i found english interface instead italian.

I've read about regedit code to obtain a specific language and i've verified in regedit the binary value is set to italian language.

Why?

i've reinstalled indesign but i've the same problem.

i've deleted default dir  C:\Users\[username]\AppData\Roaming\Adobe\InDesign\Version [version]\InDesign Defaults

i've pressed Ctrl + Alt + Shift (Windows)

in attached file you can see no workspace on default document opened...is normal??

but no result..i still have english language.

help me