I have put the ESXi 5.5.0 installer on a USB stick and also a CD. The installer worked fine (from the USB stick) on the first machine that I tried it on over the weekend. Today however I'm trying it on a Dell Optiplex 3010 and the install hangs when it gets to the "Welcome to the VMWare ESXi 5.5.0 installation" screen. Neither the Enter (Continue) nor Esc (Cancel) key respond when I press them (even though the keyboard works fine during the initiation of the process). I've tried both the USB media and the CD and get exactly the same result. Any ideas??