Yes, download Sweet Home 3D installer for your system. Install it. Then move, rename or delete the files names Furniture.jar and Textures.jar found in Sweet Home 3D installation subdirectories.
Under Windows and Linux, you'll find Furniture.jar and Textures.jar files in the lib subdirectory of Sweet Home 3D installation directory, and under Mac OS X you'll find them in the subfolder named Contents/Resources/Java in Sweet Home 3D.app package (choose Display package content in the contextual menu of Sweet Home 3D icon to see this hidden subdirectories).
Thank you very very much or anwswering so fast!!
I adore SH3D and use it very frequently.
I took the liberty of posting a wishlist at Sourceforge with suggestions to further improve SH3D.
Once I have imported all my models again, and have been able to get SH3F working, I will post all my models (hundreds!) on the internet, or maybe here on the forum!