Windows machines can crash for many different reasons. Normally, you can recover the OS by booting on a Windows XP/Vista CD and repairing the OS files.
When encrypting your drive with FDE, you add an extra layer of security to your data on the hard drive. This prevents access to the data on the drive, unless you authenticate to the Pointsec PC/FDE preboot authentication.
If the Windows OS crashes and you want to recover the data on the drive, you can run Pointsec PC/FDE recovery. It allows you to decrypt your data on the hard drive when you are unable to get to the OS and perform a normal uninstall of the software (e.g. in cases where Windows has crashed and Windows Safe Mode fails).
sk32906: How to create the Pointsec recovery media