Sorry for the delay in responding - real life got in the way.
Robust Copy, or robocopy, can copy your files to another disk or network drive. I came across this in the Vista forums - how to use robocopy - Vista Forums
- and it gives some advice on using it.
You can get a full list of its options by typing the following:
robocopy /? | more
If you have another hard drive, this might allow you to back up all your stuff there.
Now, what you need to do is determine what drives your system thinks it has, and what it has access to so you can find your Vista stuff and then try to back it up - I imagine robocopy will copy to a DVD as well as another HD or network drive.