I have encrypted the whole hard disk with TrueCrypt. Now I wanted to install virtual machines ( both VirtualBox-1.6.4-Win_x86 and VMware ESXi). Note that Virtualbox installation process is suppoused to be done after system starts. ESXi installation process can only be done in pre-boot environment. However, both installations, failed cause the drive is completely encrypted. I understand I have to do it while the drive is decrypted. -I'm wondering, will the existence of virtual machines affect the encryption in any negative way? -If I run different versions of TrueCrypt on host and virtual machine could there be any colision (since TrueCrypt driver is running on host all the time) ? Hope somebody can help me.