Please do not worry. There is no limit on how many times CloneDVD 5 can be registered on the SAME computer. Although the same serial number is forbidden to be used on two or more computers. Please just freely reinstall CloneDVD 5 on your pc and register with your previous info.
Here please note do not to change your previous registration email address. For the email address has already been bundled with the serial number and it is also the only key to retrieve your serial number in the future.