As proposed by aperezm in https://sourceforge.net/tracker/?func=detail&aid=2802547&group_id=152568&atid=784665 try to run Sweet Home 3D from its Jar file by following these instructions:
1. Install Java at http://java.com if you didn't already
2. Download http://prdownloads.sourceforge.net/sweethome3d/SweetHome3D-2.0.jar
3. Open a run dialog from Windows Start menu > Run...
4. Type the following command in one line:
javaw -Xmx512m -Dsun.java2d.opengl=false -Dsun.java2d.d3d=true -Dsun.java2d.noddraw=false -Dsun.java2d.ddoffscreen=true -Dsun.java2d.ddscale=true -Dj3d.rend=d3d -jar \path\to\SweetHome3D-2.0.jar
(replace "\path\to" by the real path where the file "SweetHome3D-2.0.jar" can be found)
5. Click on Ok
Please report here or in bug tracker if it works or not.