[Haskell-cafe] Upgrading to Haskell Platform

Hi: I am running GHC 6.10.4 on Mac OSX 10.6.2. Somehow, I have a broken version of Cabal (1.6.0.3) installed. In order to fix it, I thought I should just upgrade to the Haskell Platform. Is it necessary to uninstall my current GHC first? If, so, how? Thanks you. Cheers, David