extract win64_11gR2_database_1of2.zip into win64_11gR2_database_1of2 folder first.
Then extract win64_11gR2_database_2of2.zip into win64_11gR2_database_2of2 folder.
copy all 4 files in database/ stage/ components folder in win64_11gR2_database_2of2 folder(unziped) & paste them (no replacement) in database/ stage/ components folder in win64_11gR2_database_1of2 (unziped).
Then run the setup again. I experienced in it. It works..