I translated your issue into English, and from what I understand it is likely an issue with the location of Pegasus Mail. Bottom line, it must not be in the c:\program files directory tree as that is read-only.
So I think that copying files from a Windows 7 location may be at fault. You should plan to install a new copy Pegasus Mail in a directory like c:\pmail\. Once installed, all your folders and other data can be copied across.
Do not allow the default Pegasus Mail location to be used.