No problem. I am sorry that none of my suggestions had helped you and I hope that you are able to eventually resolve this issue. Perhaps it is time to install the OS X Lion then simply migrate your existing Snow Leopard settings and files to it manually or via the Migration Assistant.app.
thanks again for your kind help
It is possible that your booting problem is complicated by an outdated version of the Chameleon. You could try a Windows based Chameleon installer or a manual installation via the single user mode. Here is the latest Chameleon 2 RC5 v1377 boot file which you can simply drag and drop from Windows into the root of your Snow Leopard partition. It is a shot in the dark, but it can't hurt and might actually allow your system to boot.