It looks like you don't have an OS installed. Just for fun though, try rebooting the computer and manually selecting the Hard drive as the boot media (probs have to hit F12 to get to boot list). If that doesn't work you need to install an operating system on your hard drive using either a USB installer or CD. You have to pay to get windows, but if you want a workable free OS try Ubuntu. Just download the latest ISO image, burn it to a CD, and pop it in your DVD/CD drive. After that you should be able to just follow the installer, which is pretty self explanatory.
When I press F12, It brings up a blue screen and asks for a CD / DVD: P1 - HL - DT - ST DVD RAM GT30N