First of al, welcome to Xith3D and this board

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I went through the installation tutorial, and after compiling HelloXith3D.java I get the following error:
HelloXith3D.java:118: cannot find symbol
symbol : variable Cube
location: class org.xith3d.test.HelloXith3D
Geometry geo = Cube.createCubeViaTriangles(0, 0, 0, 1, true);
^ 1 error
I'm running Windows XP. Thanks for the help.
HelloXith3D is from GettingStarted Guide, isn't it? It isn't advisable to use it, since it is based on a much older xith version. Please use Xith3D in a Nutshell (downloadable from the doc section in xith.org and included in the latest snapshot).
createCubeViaTriangles is only available through the class org.xith3d.test.util.TestUtils. Please create an instance of the class org.xith3d.geometry.Cube to create a new Cube.
Marvin