You may have experienced a co-incident hardware failure: hard drive, power
supply.
Can you enter the BIOS? Do you see all your devices/drives? Is the time
correct?
If you cannot see the C drive you have your sad answer.
Since you can boot from a CD:
I would go repair console and use the DOS prompt, if you understand how to
do that, to see if you can read your hard drives.
If you can then run scandisk and see if any fixable problems come up.
If you understand DOS commands you should be able to copy files to a second
hard drive or a new file on the hard drive that should be immune to an OS
reinstall as long as you do not reformat.
OR: go to the install VISTA sequence and see if your current installation is
recognized and fixable.
If your installation is not recognized make sure you have backed up all the
files/documents etc before you reinstall Vista or you may lose them all.
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