This usually happens due to an existing installation of XRL not uninstalling correctly:

Please carry out all of the following steps to resolve:

- Logon as domain admin
- Uninstall XRL ticking the completely remove box
- Use advanced uninstaller pro or a similar powerful uninstaller program to remove all traces.

If the above carried out and still receiving the error
- you may need to manually check the folders/registry for Vision/Lasata/Agora etc
- Run a registry cleaner such as C Cleaner just to be sure
- Reboot the PC
- Reinstall XRL