This application has been discontinued
"The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP. Windows 8/7/Vista and later offer integrated support for encrypted disks and virtual disk images." Another message on the official website says: "Using TrueCrypt is not secure as it may contain unfixed security issues." However the sudden halt and suspicious suggestion to migrate to non-FOSS alternatives has lead many to question the legitimacy of this message.