To boot a TrueCrypt Rescue Disk, insert it into your CD/DVD drive and restart your computer. Note that even if you lose your TrueCrypt Rescue Disk and an attacker finds it, he or she will not be able to decrypt the system partition or drive without the correct password. In the Rescue Disk screen, select Repair Options > Restore original system loader. The first track typically contains a system loader or boot manager. Your TrueCrypt Rescue Disk contains a backup of the original content of the first drive track (made before the TrueCrypt Boot Loader was written to it) and allows you to restore it if necessary.The partition will be mounted as a regular TrueCrypt volume (data will be on-the-fly decrypted/encrypted in RAM on access, as usual).
After you boot a system, run TrueCrypt, click Select Device, select the affected system partition, click OK, select System > Mount Without Pre-Boot Authentication, enter your pre-boot-authentication password and click OK. If you do not have multiple operating systems installed on your computer, you can boot a WinPE or BartPE CD/DVD or you can connect your system drive as a secondary or external drive to another computer and then boot the operating system installed on the computer.
Note that this feature cannot be used to decrypt a hidden volume within which a hidden operating system resides (see the section Hidden Operating System).Note: Alternatively, if Windows is damaged (cannot start) and you need to repair it (or access files on it), you can avoid decrypting the system partition/drive by following these steps: If you have multiple operating systems installed on your computer, boot the one that does not require pre-boot authentication. boot your MS Windows setup CD/DVD to repair your Windows installation. Enter the correct password and wait until decryption is complete. In the Rescue Disk screen, select Repair Options > Permanently decrypt system partition/drive.