A compilation issue has been found in vboxwrapper 0.8.3 (packaged with GNS3 0.8.3) preventing you from running VirtualBox VMs with GNS3. This problem is only on Windows 32-bit systems and can be fixed by replacing vboxwrapper.exe by this new version (0.8.3a). Details about the problem can be found on this post.
Thank you to all the users who reported the issue.
