|Put the OS disc in the CD drive.|
Push any key to boot CD on prompt.
Go to the Recovery Console by typing "R" at the setup screen. This will not wipe your drive.
When it asks for a password it is generally blank so just hit enter.
Type "chkdsk C:/r" without the quotes. The /r tells the chkdsk to "repair" and "recover". Hit enter and wait till it is funnished. It may take a very long time.
When it is done reboot and see if your system is intact.