If this happens with the free version too, you could try to run it from the command line to get some information about the error, following these instructions:
- type Windows + R keys, type [font=courier new]cmd[/font] and <enter>
- drag and drop [font=courier new]SweetHome3D.exe[/font] from an Explorer window (probably found in C:\Program Files\Sweet Home 3D or C:\Program Files (x86)\Sweet Home 3D folder) in the cmd window you opened in previous step
- type a space then [font=courier new]2>log.txt[/font] in cmd window to obtain a command like: - type <enter>

The program will fail but this time it will create a [font=courier new]log.txt[/font] file in your home folder that could contain some useful information to understand your issue. Please copy paste its content here.