If you install RHDS Beta2 under Vista to a path anywhere on your C:\ drive, it will immediately fail when it tries to copy the first file with a long error ending in "Access is Denied".

The solution, as with many Vista install problems, is to run the installer as Adminstrator. Unfortunately, you can't just right-click and 'Run As Administrator' for a .jar file though.

I ended up launching a 'cmd' prompt as administrator, and then running the .jar installer from inside that console, which causes the installer to run as administrator. I'm open to hearing a more elegant solution though...