[Haskell-cafe] Trying to install cabal

Dear all, I have downloaded cabal and am trying to install it but have gotten the following error message: C:\cabal\cabal-install-0.5.1>runghc Setup configure Configuring cabal-install-0.5.1... Setup: At least the following dependencies are missing Cabal >=1.4&&<1.5, HTTP >=3000&&<3002, zlib >=0.4 I'm not sure from this message what packages I need to install to get cabal up and running. Can anyone help? Eric M.