Thanks, I reinstalled and it seems to be working now. But, I don't want that to happen again as I had taken an afternoon off work to finish a project and it was wasted. Any ideas why it happened? I hope it's not a regular fault. I think it said-''Error 59'' and ''You have no authority'' (or something similar). Thanks again.
Should you not be able to see the "AppData" folder, you will have to change the respective setting. To do so, go to "Folder options" in the Control Panel and activate the option "Show hidden files, folders and drives" under "View"/ "Hidden files and folders".
Then reinstall the program using the download version. You can find the installer in your Service Center account at www.magix.com.
Start the program after successful installation. If the activation dialog does not appear at the first program start, select Help > Register Online.