[Haskell-cafe] Flushing Cabal's cache

I am getting the following error :- C:\Languages\Lexer\Haskell>cabal install ranges Resolving dependencies... cabal: Error: some packages failed to install: ranges-0.2.3 failed while unpacking the package. The exception was: user error (TAR checksum error) I am on Windows Vista, is it possible to clean or delete Cabal's cache ? Many thanks in advance, Aaron