Web Deployment Manager "Unknown Error" (IIS7)

I've been at this all day, trying to get Web Deployment setup on my server. First off, I'm running IIS7 under Windows Server 2008 Data Center 64bit (on a VPS). At first I thought I had it working, but it seems I was using the old (Windows Administrator login only) IIS6 stuff that comes alongside IIS7.

I've followed this guide perfectly, and I'm still getting errors: http://learn.iis.net/page.aspx/516/configure-the-web-deployment-handler/.

This is the error I receive (as per the directions at the end of the article): http://i.imgur.com/1HC7F.png

Any help is appreciated. I've tried everything (I've verified all the basic things like LOCAL SERVICE folder access, IIS Manager permissions, the service is active, etc).

Thanks, I know someone on SO knows this stuff ^_^.