This installation package could not be opened, Bootcamp 3.1_64-bit, Windows

Followed install directions carefully, and windows 7 is running fine on my macbook pro. It was a new install, on new laptop. I updated software and drivers.

I am trying to install an application (morae) and it is not working. I download ap and try to run the .exe file and
Wise Installation Wizard opens, and then I get an error message:

This installation package could not be opened. Verify that the package exists and that you can access it, or contact the application vendor to verify that this is a valid windows installer package.

Please help.