Windows Explorer does not have menu displayed by default like you were used to in previous versions. To activate and keep it permanently visible follow this tutorial.
If you need, besides major accounts, an extra account with limited access to data, you can add Windows 8 Guest account. The process is almost the same as in Windows 7.
FLAC is an audio file that enables you to play songs without the lost of sound quality unlike MP3 files for instance. I will show you what you need to do in order to play FLAC in Windows 7 - Media Player 12 .