|Without an installation CD I am not sure what you can do. Is there a restore partition on the hard drive? You could perform a factory restore. You will lose all personal files, installed 3rd party software and updates. You could copy your personal files using a number of different programs.|
In the mean time you could try booting to Ultimate Boot CD and see if you can do anything with it. Or get a live version of Linux and boot to it. That can also be used to recover personal files. You will need a place to copy them to. Your optical drive will be in use.
Get UBCD at the link below. Get Linux puppy at the link below that. Finally, there is a third