Hello Amandavn
Sorry for the delay in my response.
Have you managed to resolve the issue?
This occurs when files are missing from the directory or when there is a permissions issue blocking access. In other words, if the .XLT files are not in the folder location that is specified in that message, the software cannot find them, or if you do not have the permissions to work with that data, you would get this message. When you tried to reinstall the AccountRight software, did you make sure any antivirus software was disabled, and run the installer as Admin (right click Run as Administrator).
Please let me know how you get on.