Which Solaris CD do you have? It doesn't appear that you have OpenSolaris 2008.05. You can get OpenSolaris from here: http://www.opensolaris.com/get/. It's a live CD that once loaded, you can then choose to install OpenSolaris.
I got this problem on my older comps too. If I right, the problem is the processor. The Solaris 2008.05 live cd is only suit in 64bit enviroment, when you try to run in 32bit system you will see this error. I cannot find yet another live cd, that suit for 32bit. Any idea?