Visual Haskell 0.2 installer bug

[Ben Rudiak-Gould]

The Visual Haskell 0.2 VS'03 installer, downloaded today from

   http://www.haskell.org/visualhaskell/release-0.2/VSHaskell71.msi

doesn't work correctly when a nonstandard install root is specified. All of 
the root-folder files go into the correct place, but files in subfolders 
(like bin) go into Program Files\Visual Haskell. Then when it comes time to 
register bin/vs_haskell.dll the installer looks in the correct place, 
causing registration to fail since the file isn't there.