This attack only works on Full-Disk Encrypted systems, or otherwise requires that the volume be mounted at the time the attack is undertaken (or when the system last hibernated). the attack works by accessing the key in ram, which wouldn't be possible in the case of a unmounted volume. If the key cannot be found in memory, it attempts to find it in hiberfil.sys, but if the volume was not loaded during the last hibernation, the key will not be there either.
NOTE: If the target computer is turned off and the encrypted volume
was dismounted during the last hibernation, neither the memory image
nor the hiberfil.sys file will contain the encryption keys. Therefore,
instant decryption of the volume is impossible. In this case, Passware
Kit assigns brute-force attacks to recover the original password for
So, use a strong password, disable hibernation, and do not mount volumes on boot (only mount on demand when you need to, and dismount when you are done) and you should be pretty safe against this tool.