win32 installer: remove old code, correct the ghc version in some of the error messages
win32 installer: remove old code, correct the ghc version in some of the error messages

darcs-hash:20080624191819-21862-8cef691b8a972900dbc1ed5af7a022fe553da035.gz

thiagoarrais/gtk2hs,thiagoarrais/gtk2hs,thiagoarrais/gtk2hs