According to the information released on the Internet, this problem appears at numerous Windows Vista users. A solution to resolve this issue is to update your video card. If the result is still negative, then a compatibility problem can make this application stop working properly. 3D Home Architect Deluxe was not developed especially for Windows Vista. However, this application works with this operating system, but sometimes it can make you problems. I recommend you reinstall 3D Home Architect Deluxe.