Crystal Reports on Windows 7 64bit with C++

Question

Hi,

i have a qt application that opens a Crystal Reports window.

this applications works in WindowsXP 32bit but does not work on Windows7 64bit. I see a blank/emty white screen. i even cant see the buttons of crystal reports.

i make another project in C# that opens a Crystal Reports window on Windows7 64bit and it works fine.

do you have any idea about that problem? have you ever met such a problem before?