You obviously did not search the forum and the web, that violates our for um rules !!
You did not provide any information about your setup, that's another violation of our rules !
Why are people unable to give basic information like C::B-version (probably build-date), OS and version and compiler and version ?
The only thing I can see is, that you are on windows, but there are many version of that "OS" out there, and there might be incompatibilities with MinGW, especially on vista and win7, so some more information is needed, but first make sure your compiler is configured correctly.