[Dev-luatex] luatex in windows

I try to use luatex on windows, but I have the following error message: This is luaTeX, Version 3.141592-0.1-alpha-20060818 (Web2C 7.5.5) kpathsea: Running mktexfmt luatex.fmt luatex.exe: fatal: kpathsea: CreateProcess() failed for `mktexfmt 0o☺☻ex.fmt' (E rror c1) . Can you please help me. I have the followin tex version: MiKTeX-TeX 2.4.1603 (3.141592) (MiKTeX 2.4) Copyright (C) 1982 by D. E. Knuth; all rights are reserved. TeX is a trademark of the American Mathematical Society.