[Haskell-beginners] getting cabal to work under windows 8

Hey, I have installed haskell-plarform 2013.2.0.0 on windows 8. I have MinGW + Msys isntalled. I am trying to install some package with cabal. So I do: cabal install netwire in the msys console. Now I get: cabal.exe: The program ghc-pkg is required but the version of c:\Program Files (x86)\Haskell Platform\2013.2.0.0\bin\ghc-pkg.exe could not be determined. ghc-pkg.exe exists at the given position. What am I missing? Thanks! Nathan