This is a result of the activation process not having Administrator privileges on Windows Vista and Windows 7 when trying to authenticate and save your key into the registry.
In order to bypass this error please do the following:
- Right Click on the icon which starts the program.
- Left Click on Properties
- Left Click on the Compatibility Tab
- Check the box for "Run this Program as administrator"
After this process is completed the program should authenticate your serial key properly and start the program.