I tried to download 11g r2 set up file from oracle site,
but few files were missing while installing and at the final installation it had given lot of errors like missing files on
D rive etc , n not I get error while using usn password
ora-12560 tns protocol adapter error , please advise .
So if "few files were missing while installing and at the final installation it had given lot of errors" why would you continue and expect things to work?
99.999999 % of complaints about 'files missing' during installation are due to not reading the instructions with the download. Specifically, the part about unzipping both downloaded zip files into the *same* directory. Unfortunately, this is NOT the default behavior in Windows.