See if you can backup your important data using a backup utility that can be booted from a disc. If you can see the installation, that should be a good sign as far as signaling the hard drive is still working. It sounds like however that the systems files have become severly corrupted or you might have possibly got a virus.
Since a repair on the hard disk is not going to work, you are going to need to try the last resort method and wipe the hard drive to re-install Windows. If you dont have the install media for Vista and your recovery partition doesn't fix the problem, you'll need to contact technical support for the manufacturer of your computer if you are covered under a warranty.
Since a repair on the hard disk is not going to work, you are going to need to try the last resort method and wipe the hard drive to re-install Windows. If you dont have the install media for Vista and your recovery partition doesn't fix the problem, you'll need to contact technical support for the manufacturer of your computer if you are covered under a warranty.