Can't seem to figure how to compile

Running ghc 6.6.1 On Windows Vista I get this error when I run: ghc Main.hs gcc: installation problem, cannot exec `as': No such file or directory On this code: module Main where main = do putStrLn "Please enter your name: " name <- getLine putStrLn ("Hello, " ++ name ++ ", how are you?") What is my problem?