Start Rainlendar from the "Debug Rainlendar" shortcut in the application folder and check the list of paths from the log file. If you did a portable installation all of them should point to your external HDD. Also check if there are any errors in the log which might show the reason for the problem.
i asked some of my IT frenz about it, they said its cos of the registry key thingy
I tried a reinstall last night, at home.
There's no log file in the hdd when i looked at the folder.
There use to be 1 before i reinstall the program