Compaq computers use F10 to get into the Bios Just need to hit it whenever you see a cursor blinking in your up right corner of your monitor. Compaq used to, I'm no sure if now they still using part of the hard drive as part of the Bios configuration. If you re partitioned your hd them hopefully your puter don't use part of the hd as a BIOS and you didn't delete it; if thats the case you will have to go to compaq website and download the softpaq that will create that partition. if you have more questions about it just post or pm me