That is the Windows (UAC) security that has altered your registry. Here is how you fix that.
1. From the link supplied below, download the "invalidauthfix.zip" file.
2. Unzip the file, double click the file, allow the update to the registry then restart the computer. Windows may properly warn you that the update will make changes to the system, that is correct. It is warning you in case you don't know what you are doing or what the update is about. The update was written by us to resolve this issue and it is safe.
3. Now AccuRIP will either run again if it was a computer that had a previous install and was OS updated or it will ask for the serial number.