As far as I researched now it should work at windows 7 64bit, too. Have you perhaps tried to run the File from within the ZIP File? I have the suspicion that the exe could perhaps take a existing dll File from your system from a different path. But I don't know why...
Has 64 bit Windows 7 a 32 bit compatibility mode for applications?
@processname*32
The entry point in the procedure "?nextNode@QHashData@@SAPAUNode@1@PAU21@@Z" was not found in the library DLL QtCore4.dll