Many users were impacted when Truecrypt was shut down as a project. The need to completely encrypt the entire hard drive on Windows systems in particular was unmet for a period. The VeraCrypt project aimed to fill that void by providing an updated tool based on the TrueCrypt code (and backward compatible with it). And VeraCrypt fixed a few flaws in TrueCrypt.
Security firm Quarkslab recently performed an audit that revealed 8 critical flaws and several others. VeraCrypt has responded by issuing a new version, 1.19, that addresses these flaws. The flaws were almost exclusively related to the implementation of support for UEFI booting technology (which was not supported under TrueCrypt and replaced the old BIOS systems). This is the least mature part of the new Veracrypt code and so the discovery of flaws is not unanticipated.
Fortunately the new version addresses the flaws and should provide users with an excellent option for keeping data on Windows computers secure. VeraCrypt is free and open source.