It is strongly recommended for users to take back-up on Pen/CD drive regularly so that in the unlikely event of System/HDD crash, important data can be restored from back-up. To format hard disk, copy folder into another drive or CD / Pen drive. After formatting HDD, just copy folder back and run Msetup.exe to reinstall software. Software lock will not be affected. If HDD or system is damaged and folder cannot be copied than after formatting HDD, install by running msetup.exe and than restore all company data from back-up.