Do you still run Meteonorm version 6.1 (2009) or an even older version on your computer? Then it's time for an upgrade.
Backup your settings and get the new meteonorm software running on your computer
In the meteonorm software version 6.x all user defined sites are saved in an Access database, located in the output folder:
c:\Program Files\Common Files\MN61\output\stnuser2005.mdb (possibly c:\Program Files (x86)...
Please save this file to another place before uninstalling the old Meteonorm version 6. You can import the locations in Meteonorm software version 7 via the menu "Locations - Import user defined locations".