I am about to virtualise a Poweredge 2900 and wish to use a bare metal hypervisor. I am looking for a free version that has a GUI interface. The VMWare licensing info is very confusing. I think I need ESX 4.0 but I can't seem to find a download. I've downloaded ESXi 4.0 and it mentions 60 day evaluation. There is no option to enter a license key through the installation. Do I have the wrong version?