I don't want to tell you how to troubleshoot your problem, but it sounds like you may be trying an approach that is more difficult than your situation.
Let me state your problem and you fill in my blanks:
Your Windows Vista system works without any problems
One day, you don't hear any audio, you check the settings and can't find any problems there, so you reinstall your audio drivers.
That fixes the problem, so you listen to music, browse the internet, maybe watch a movie, and shut down the computer for the night.
Next day, Windows can not load normally.
You use the Vista DVD to perform a system restore. This has no effect whatsoever.
You still cannot boot to Windows Vista.