I have vista ultimate installed on my c: drive
I connect my external esata and turn it on before turning on pc...the bios looks at my external first and thinks that's the boot drive and gives me that message...
I restart, change order in bios...and no problems...
so, are you installing off a cd?
if so, make sure your bios supports boot from cd...that should be fine
oh and legit software?
the message comes up when either i boot from the blank HD, or when its trying to boot from the (yes legit) XP home cd, it says 'Press any key to boot from cd....."