encyclo - 8:00 pm on Sep 5, 2010 (gmt 0)
If you don't have a backup (which you should - but now you know for the next time!), I would suggest getting your files moved to a fresh VPS. It will be quickest and easiest in the long-run.
Other than that, your hosting provider may be able to provide you with the files assuming the installation was relatively unmodified.