Hello, sry for my English

I have a Problem with the Qt Creator, when I compile a project came a error Message (my Qt Creater is German) "It is not a valid set Qt version. Put them under Tools / Settings" and then I go to the Settings and in the Qt4 -> S60 SDKs and there is a error message, too "The file 'devices.xml' containing the device SDK configuration could not be found looking at the registry key HKEY_LOCAL_MACHINE\Software\Symbian\EPOC SDKs\CommonPath or the common program data directories."
I dont found in google a answer. I have start the installation as administrator but it don't go.
What can I do?
Sry for my bad english im from Germany :P
I hope you unterstand me.