The space occupied by Sweet Home 3D is:
- the program probably in [font=courier new]C:\Program Files\Sweet Home 3D[/font] folder
- the content of [font=courier new]C:\Users\user\AppData\Roaming\eTeks\Sweet Home 3D[/font] folder
- the SH3D files you created.
After that, I can't give you tips about some other things...