If you have Nero installed, you can install (and sometimes the installer for FLAC will install it for you) a plugin to burn FLAC files directly to audio disc without having to burn them. For Nero6, the plugin directory is "C:\Program Files\Common Files\Ahead\AudioPlugins". Others are in "C:\Program Files\Ahead\Shared\AudioPlugins". It's probably related to whatever version of Nero you're using, so if you try to drag and drop FLAC files into an audio disc and it doesn't work, you've probably got the plugin in the wrong folder. The plugin's filename is nxMyFLA.dll, so find it and copy it to the right folder.
The FLAC plugin, as well as some for other file formats is at
http://neroplugins.cd-rw.org/.
http://www.toritraders.com/guides/flac.htmMind you I don't use Nero myself.