The installer version (including the 5.3 Beta you tested) comes with its own private copy of Java, so whatever Java you install beside, this other version will be ignored and won't be used.
But did you also try to run Sweet Home 3D in 32 bit as proposed in the FAQ?
Sweet Home 3D refuses to start on Windows 7 x64
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Re: Sweet Home 3D refuses to start on Windows 7 x64
Emmanuel Puybaret, Sweet Home 3D creator
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