Just setup a new VM. • I will install the OS later • Other > Other 64-Bit • CPU, RAM, Network as you prefer • LSI Logic (Recommended) • Virtual Disk Type: SCSI • uncheck "Power on this virtual maschine after creation" Close VMware Workstation. Browse into your VMware dir where the *.vmdk and *.vmx is stored. Open the config file from the ESX *.vmx with notepad and edit these settings or check them: for Intel CPUs: Code: monitor_control.vt32 = "TRUE" for AMD CPUs: Code: monitor_control.enable_svm = "TRUE" for all CPUs: Code: monitor_control.restrict_backdoor = "TRUE" Ethernet settings, no double entries! Code: ethernet0.virtualDev = "e1000" ethernet1.virtualDev = "e1000" ethernet2.virtualDev = "e1000" ethernet3.virtualDev = "e1000" LSI logic Code: scsi0.virtualDev = "lsilogic" Memory tweaks (optional) Code: sched.mem.pshare.enable = "FALSE" mainmem.useNamedFile = "FALSE" MemTrimRate=0 Save the *.vmx, mount the ESX ISO and fire it up. Works like charme ....but is quiet senseless (run a hypervisor in a virtual maschine - for testing purpose ok). Cheers