getting "access is denied " message when trying to compile a program by g++ in cygwin

when I try check the version of gcc or g++ I get this message " access is denied " in the same time I can not compile C program beca开发者_Go百科use of this message

I need help

Try compiling from inside a cygwin shell, so the PATH environment variable is set correctly.

Based on this comment " Could not locate entry point procedure in the dynamic link library cygwin1.dll " what's missing is in fact, cygwin itself. cygwin1.dll is cygwin.