gcc382 asks for drive D:

Qt 5.3 beta, installed on Windows 8.

I clear the path with
set path=c:\qt\qt5.3.0\tools\mingw482_32\bin

and typing gcc I get a windows system messagebox telling me (in italian) that there is no disk in drive D: and to insert a disk.

On this PC there is no drive D:

The error appear also on
gcc --version
but doesn't appear on
gcc -dumpspecs

Used inside Qt Creator everything is ok, using it to compile other programs the error appears and it is impossible to use