I use foobar2000, same with the other bros above. For playing flac and Converting them files to 320bitrate cbr mp3. Got it from recommendations around the net. Works good, simple & fast.
Interface is quite simple too.
-select folder to add from the file menu (folder containing your flac tracks).
-highlight all tracks when displayed.
-right click. convert. a window will appear.
-select output file type & quality. (mp3, 320kbps cbr for me - highest)
-select folder transfer destination or create one from browsing.
-press back button after all preferences have been chosen.
-click convert(start) button.
-you're done.
......I'm pretty sure that's the workflow, but do let me know if I have missed something.