I have been using CloneCd 5.1 for awhile. My computer had a "Full Restore" due to other problems and I had to reinstall CloneCD. I have the CloneCD "Key" file saved on a floppy as instructed by Slysoft. I "copied" the Key File file from the floppy to the Slysoft folder, opened the key file and got a message that the it was "OK" and to restart CloneCD. But, when I restart CloneCD, it still shows that I have the 21 day trail version. The F.A.Q. at the Slysoft web site actually addresses my problem by suggesting to uninstall CloneCd, rebooting, and reinstalling, but that also did not cure my problem. Their Website also suggests to get help here.